Alright; round two of the game decisions--I've added a few more games to the list. Now, asterisks denote the games I'm considering, while bold denotes the games I'm definitely going to be or have already started playing. I've already gotten a vote for Maple Story, I am almost definitely going to be returning to Trickster, and I think Wakfu is still in closed beta, so the choice is really between Goonzu (which I already have an account for), Secret of the Solstice (which I really like the looks of), and Wonderland Online (which seems quite unique).

*Maple Story--1.5GB
*Trickster--2.5GB
*Goonzu--1GB

*Secret of the Solstice--1.6gig
PiStory--(Definitely compatible with Vista)
*Wakfu--
*Wonderland Online
Aurora Blade (web-based)
Bread n Butter (web-based and not an MMO, but a mini-game game)
Tales Weaver (not english)
Time n Tales (not english, can't find screenshots/video)

Eve Online (p2p)
Ragnarok (p2p)

I think I'm going to go in and do more racial and profession research. More feeback!

Edit--I now have accounts for all the asterisked games minus Wakfu--Secret of the Solstice because I joined Bread n Butter; PiStory because I joined Aeria Games to sign up for some closed betas; Wonderland Online because I joined Aurora Blade, which is ub3r-lame.