20 gigs is too little. If you get a pro you get 60 gigs which should be fine. I can have a couple of games installed. The installs can be from about 5-8 gigs depending on the game. Installs take about 10-15 minutes so I only install games that I am currently playing.
They have deals like the Resident Evil bundle where you get a 120 gig which would totally rock if you were getting the game anyways. Rumor is that they are making a larger drive.








