HELP! Which one to sell: PS2 or Xbox 360?

I urgently have to buy a new PC, but I don't have the cash. The only things I can sell are either my PS2 or my Xbox 360 slim. I'm not sure which one to sell. My PS2 is about 3 years old compared to my Xbox 360 (which is 6 months old), but I have a TON of games for the PS2 that me and my friends still play on now on my 29" Standard Definition TV (I don't have an HD TV so the Xbox 360 looks crappy on the standard def tv) and then compared to my 360 that only has 3 games and I basically play it by myself on my 23" PC monitor. I JUST CAN'T DECIDE! :-(