There isn't much i want that i don't have. A house, just because it isn't economical to buy a house until you get married (or are otherwise willing to settle down for at least a decade to make buying the house worth it), and i'm probably a good 3 years off from marriage and that's if i'm lucky and meet the right girl in the next year or so.
A cat, because i feel like you shouldn't get a cat if you have anything smaller than a two bedroom apartment. Poor thing would get bored (plus no semi-private space for kitty litter).
Maybe some retro game consoles, like a Saturn or a Dreamcast, but that's not an issue of money but rather that i barely have the time to play the games for the systems i already have.