Pathfinder (Pazio Only or 3rd Party Allowed, I really don't care):
Solo game:
Anything with an interesting/weird concept.
Something along the lines of Kingmaker, but with original content/worldbuilding.
Party:
Something with a high posting rate, no adventure paths.
FATE/FAE:
Preferably in FATE, but FAE if that's what is necessary to get a group going. Something Cyberpunk or Contemporary, most likely. No video game/tv show/movie worlds though. Something nice and original.
Shadowrun:
A system I haven't gotten around to trying. Would be interested in playing most likely, seeing as I love the gritty cyberpunk setting :)
Golden Sky Stories:
I love the simple concept behind this game and want to invest time and writing power into playing it.
