I had two toshiba laptops, one hp and one Sony.
Both of the toshiba broke down within a year or so. My second toshiba is still working but the LCD have some connection problems so I cannot see anything unless I connect it to an external LCD.
My Sony laptop (cost around 1.4k when I brought it back then) is still working too (even after 6 years), although the specs are worthless nowadays.
My Hp laptop (pavilion dv7 6187cl
) I have almost used it for a year. Got it from sam's club with tax exempt. Quite cheap (1.1k) for the specs. (Although my friend got his a month afterward online with discount code.... allowed him to have around the same price but better specs with the graphics). From my experience, the fan does get noisy when I play games or open 46 (I counted it) browsers at once. Other than that, the laptop is golden. I have yet to experience overheating but it does get hot when I open 46 browsers AND play games. I used to open vmware with it and the laptop handled it beautifully. Hp and sam's club customer service is also good. This is actually my second one. When I got the first one off sam's, I noticed that I can feel electricity and went on the Hp forum. The customer rep there was helpful. I eventually brought the laptop back to sam's for an exchange (which is done quick and efficiently). Found out second laptop is the same and eventually I found out my AC socket was giving out too much electricity. I then used an AC extension cord to fix the problem.
Thus, from my experience. Get a Sony if you can afford one. They're not noisy, not that hot and certainly durable. The sony is not noisy either. However, they ARE costy.
On to my suggestion with your laptops.
First of all, bestbuy is a ripoff! The cost of the laptop is pricy regardless of the specs if you buy them from bestbuy. You will most likely get better laptops at cheaper rates elsewhere.
Second, try to find online coupons and buy them directly from the manufacturer. Sometimes that save a whole lot. You can always put the coupon there and then check the price it will cost to buy it and then compare it with similar laptops with similar specs. My friend got that 30% off hp coupon and made his laptop around my price with better specs in the graphics department. Most of the coupon codes are online, just google them.
Now to begin review of your four laptops.
The $630 is obviously the better choice (you can figure why it cost 640 while the rest cost around 330). The 6gb memory will allow you to run much more stuff. Seeing as how windows 7 already takes up almost 1 gb memory and the pre-loaded factory apps of the laptop (I never bothered deleting them and it's a pain to do that... you can get rid of them all if you reinstall a clean windows 7 though) will take lets say half a gb of memory. Thus, just by having the laptop on, 1.5 gb of memory is being used constantly. That said, it is always better to use more memory if you want to run lots of stuff at once. My laptop oftentimes use around 5gb worth of memory (I open WAYyyyyy tooo much stuff). Also, the laptop comes with beats audio (mine does too) which is great. There's two extra audio outputs in the front which you can turn on or off. The beats audio makes watching stuff on the laptop wayyy more comfortable. Sound quality is very high.
If you are planning to only run a few vn and games one at a time while also doing some light surfing (by that, I mean not opening 46 browser tabs like myself), all of the laptops should fit your requirement. There really isn't that much of a difference in specs between them (the 320s) -- a reason why the price of them are so similar. The acer might have 500gb hdd but the speed of the hdd is still 5.4k rpm so it don't really do much good. You can have some more stuff but your laptop won't be any faster. That said, if you compare them with the 320gb from bestbuy, you can tell by what I mean that bestbuy overprice their junks.
That said, I can give you a review of the looks of the hp laptop (if you have only seen it online). The dv6 will come looking shiny, metalish aka brushed aluminum. Do note that the aluminum can fall off and when it does, the interior is black. The left side of mine where I usually lay my hand when playing games have encountered that problem. The 14" pavilion will come in a plastic looking. Kinda dull and not really stylish. The touch sensitive keypad will also feel like those popped out dots for blind people instead of being smooth.
My suggestion is to get the Asus. It looks nice and you don't really need the dv6 to run what you want to run. My other suggestion is to look online to see if you can find cheaper laptops or try other stores than bestbuy.
The best way to transfer would be to buy some kinda wire to directly connect two computers together and transfer them. I have yet to try such a method. The wire should cost you around 15 bucks or so. Just go to some store and ask them. You should be able to find them at bestbuy for sure.
The other way, which is how I usually do it, is to buy external hdd and put files onto hdd and put the hdd onto other laptop and transfer files. It's just like having a extra large capacity flash drive. I do it this way since I have 4 external hdds and I store extra files on them too.
The last way that I know if is to store the files online and then download them.