Pretentionist and grouper. Pretentionist fits pretty well, i do tend to pick out more indy titles. Grouper works in a way, if i'm playing a game that has coop available i like to make use of it, most games i play don't though and that's no worries for me.
Think pretentionist along with some sort of leaderboard/achievement whoring/challenge type thing would be pretty much dead on, tend to flick about between things like flower and the path and such to soldner-x and other tricky games to beat on harder difficulties and get trophies and such, before moving onto guitar hero to boost my expert FC count or beat a few scores.