I started doing some IPv6 testing at home and I was surprised to find out that at work our colo provider is now offering v6 transit
Who's doing your colo?
NAC.net. They're in NJ (HE doesn't have any facilities on this coast that I know of) and they're an interesting ISP. They are sort of a mini-HE.net - they have quite a bit of peering - last I knew they had facilities for cross-connecting with people in Secaucus, Newark, Toronto, New York, WDC and London. It looks like their IPv6 transit is through NLayer.