Since the last gen consoles are going for less than a new game now adays, I'm thinking about pick them up and play some of the great older games.
So far I have;
PS2
Kingdom Hearts -Got to the last boss, but could never beat him)-
Kingdom Hearts 2 - Same, Got to the end but couldn't win
Kingdom Hearts RE: Chain of memories - Played it on the GBA, but think it will be much better on the PS
FFX - Got a few hours in
Digimon 4 - HUGE digimon fan. This game was just to difficult for me to play back then, though
Gamecube
Sonic Adenture 2: Battle - One of my favorite games of all time. I must have sunk dozens of hours into the chao garden
Sonic Riders - Another favorite. I usually hate racing games, but Sonic characters+hoverboards=WIN
LoZ: Windwaker - Never finished
LoZ: Twilight Princess - Got to last boss, but couldn't win
Pokemon XD Gale of Darkness - Finished, but really really want to play it over again
These are all games I've played, but never finished.
I was 10 back then, Don't judge me

Plus the fact that the Hour/Price Ratio is pretty damn good.
Any other suggestions?