In reply to DiscoBoy:
Thanks for the input, all. We'll be going to TCA, I think. The slightly lower walls at TCA, and tales of sketchy last moves at bloc have definitely sealed it; my girlfriend is 14 months in to a serious ankle injury from falling when bouldering, so TCA certainly sounds better.
TCA also has the benefit of being the first place I ever bouldered, so there is that as well!