I'm loving the PS2 at the moment. You can find games on the cheap (albeit having to check for scratched discs), and with an upscaler they look ok on an HD TV.
What games are your favorite ? Lately I've been playing Shadow of the Colossus, Okami, GTA: San Andreas, Burnout 3 and Capcom and SNK compilations.
Also, with Rule of Rose going for hundreds of dollars, what are some other games to look out for that may increase in price in the coming years?
I've been using the PS2 slim, the silver one and it works great!