What are my options for selling my PS3?

I have an 80 gig PS3, the older one that plays PS1/2 games. Now, the new PS3 slim (rumored 240 gb version) looks pretty attractive as I’m having trouble with free space. The issue I have is that I bought a lot of games off of PSN, I don’t know what the process of selling the PS3 is like and being able to retrieve all my games afterward. Please advise?!?!

Also, what kind of money can I expect for my current PS3 in the used market?