I just painted my bathroom with Benjamin Moore's low VOC Eco-Spec paint.  I have to say I was very impressed with the results.  The walls were already white so I didn't have to prime, but I only had to do one coat to get good coverage.  It's a bit more expensive than the non-eco friendly paints, but in my mind it's well worth it.  

I too recently repainted with BM's Ecospec paint.  I also think that it covered just as well as their Regal line.  As for cost, BM has always been more expensive than other paints you'd find at home depot, but the Ecospec was a few dollars cheaper than the Regal at the store I went to in northern Virginia.  If I have to paint again, Ecospec will be at the top of my list.

The odors of paint sure is disturbing. I never have to ensure with them since the paint I usually got from the store is odorless. I'm not sure if it's termed under eco-friendly paint. But I think it should. Nice tips on though.