I don't need to know where to get them, just which one does best. Oh and, yes gaming does improve with better HDD's, my HDD now gives me 8 more FPS than my old one.
Seriously dude, a hard drive has no impact on your games. That is unless your drive is being used heavily due to a lack of RAM. But in that case, more RAM would make a much larger difference than a faster HD
As stated by TOO a better/faster/larger hard drive will only help during game loading times... Or if your playing a game that for some reason wants to constantly write back to the disk (not common at all)
To put it bluntly, the HDD isn't used DURING game play at all.... only if your running out of RAM on an extreme level...