Playstation 3 questions

[Jason1]

Okay so im thinking about getting a PS3. Im considering buying a used 40GB one on Ebay for various reasons, one they are going for just under 300 dollars which is more than a 100 dollar savings off the retail 80 gig version, even more if you include tax. Two, based on what I read on Wikipedia, the 40Gb version still plays Playstation 2 games, unlike the new ones.

So, my questions are:

1. Is there a real reason to believe that 40Gb wouldnt be sufficient storage? I mean I know demos probably take up quite a bit of space, and some games require you to download some data to the hard drive, but is it really that bad? And worst case cenario couldnt I just delete the data from the games I no longer play?

2. Second and more importantly, how reliable is the Playstation 3? Is there good reason to believe that it would be a bad idea to get a used version without a warranty, based on the fact that it might break down? Those of you that have a PS3, have you ever had any problems with them?