Cambridge College HSPS

I am just about to submit my HSPS application but am unsure on which college. I have visited 12 and so far my favourites are Trinity Hall, St Catz, and Murray Edwards. I initially liked Caius the most, (but heard a lotttt about how its got very traditional right-wing values and heavy academic/competitive vibe). What I would like for a college is that it be pretty central, VERY sociable/friendly culture and ethos where people like to go out and party, more left-wing, not too competitive, good amount of state-school students (so no pretentiousness) and relatively modern accom. If anyone who goes to Cambridge could give me suggestions in which college to go for I'd really appreciate it!!!!!!!