Tricky.
So far I've played a paladin/sorcerer, a ranger/monk, a sorcerer, a monk/psywar and a ranger (cohort)
so that looks like 1 paladin vote, 2 sorcerer votes, 2 ranger votes, 2 monk votes and 1 psywar vote.
If I include class levels: paladin2/sorc4, ranger6/monk1, sorcerer 12, monk4/psywar 2 and ranger 10 comes out as:
so that looks like 2 paladin votes, 16 sorcerer votes, 16 ranger votes, 5 monk votes and 2 psywar votes
So I'll say a tie between sorcerer and ranger, and since some of the ranger levels are in a cohort, my final decision lies with Sorcerer..