I'm not a YC founder but I got an individual plan from Blue Cross Blue Shield (MN) through ehealthinsurance.com. It is an excellent plan (so far) and wasn't nearly what I was expecting to pay (<$150/mo).
Also, I've dealt with BCBS in the past and could never get anyone on the phone if I had an issue.
YMMV, but I will never be a BCBS customer again.
Insurance has come up a couple of times on reddit and there are always comments about how bad BCBS is. Even several comments about how doctors will say they're booked just to avoid dealing with BCBS.