Another really, really good bra to look for is a Jeunique. This is a bra that is not really for "nursing" persay but can be used that way. They have designed it so that the cup lets down just like a nursing bra so that the breasts can be positioned perfectly and this works out "perfectly" for nursing mothers. Plus, the real kicker is that there are no underwires but it provides the BEST support in any bra I have ever worn. Take it from me, a JJ girl (yeah, you read it right), I would know about good support!
I found some really great prices for these on Ebay. If you buy them from a store, they cost upwards of $88. I got the last one from Ebay at only $35.