Sauber

Actually, in terms of pace last year (not results) they were ahead of FI in second half of the season, but usually behind williams. Williams were faster than force india in second half of the season.
 
I think i read recently that they have tied up some South American megabucks as has Williams, so it could be that they improve throughout the season, and will have a proper car in contention next year. The more teams in contention the better I think.