Crucial is another brand I would add to the list of acceptable manufacturers. Depending on how you use the computer, 120GB may be enough, but I'd probably go for the 240 if it was me. 240-256 GB seems to be the sweet spot right now for finding good deals as those are the high volume models currently. I wouldn't pay more than $0.40/GB for a drive, preferably $0.35/GB or less would be a great price. Since this will be your first SSD, I'm betting your type of computer usage won't benefit from spending top dollar on the absolute fastest drive out there. The differences between the best drives and mid-tier drives from the brands that everyone is recommending isn't that significant so if you don't know specifically why you're paying more for the better drive, you probably shouldn't as it's just a waste of money.