This tank was recommended to me at the hospital's maternity shop.  I wear a 34I in the Fancee Free Extra Support Nursing Bra and generally like this tank.

The 34 F/G size fits, though it is kind of difficult to get it on comfortably - the band is quite tight to get over the girls, but it does hold them in place.  I didn't believe the lady at the shop when she told me I'd be able to wear this tank without a bra, but she was right.

The tank is nice and long - I wear a petite in tops and this one hits me slightly below mid-hip.  It's very supportive and flattering.  The only thing I'd change about the fit is to make it rise higher across the girls - I'm exposing a good 3 inches of cleavage in this tank.