Who i'd see were I going:

Friday:
Aphex Twin
Tegan and Sara
Goldfrapp*
Mum*
Battles
Aesop Rock
Les Savy Fav
Adam Freeland
Jens Lekman
Vampire Weekend
Dan Deacon*
Architecture in Helsinki

Saturday:
Kraftwerk
M.I.A.
Hot Chip
Cold War Kids
Animal Collective
DeVotchKa
Islands
Bonde Do Role*

Sunday:
Justice
Gogol Bordello
Chromeo
Metric
the Field*
Sons & Daughters
Holy F*ck
I'm from Barcelona

*My personal extra extra special recommendation for you. not that I dont recommend the others.