The ever elusive perfect bra..for nursing, that is

I am on a search for the perfect bra - for breastfeeding that is. I have tried a couple that were ok at first, but because they don't have a wire, they loose their shape really quick. I still think I am looking for one withour an underwire, but after nursing for 7 months, I am ready to try something new. Please comment if you have a suggestion for a bra that gives your pre-baby support and shape, and post-baby comfort and accessibility.