Personally I preferred the clip down bras. They are easy to clip on and off and are much easier than trying to get away with your normal bra. Yes I have tried it! Silly me. Now though bras from me are so affordable they are cheaper than buying the basic cheap nursing bras from the supermarkets.
Some bras are made from a microfibre fabric and so dry quickly and don't go hard if milk leaks onto them. (I find the tommee tippee pads are fabulous, although they're wide they are really flat and very discreet under tops- ask me for a sample if you like. They come individually wrapped too!).
Ideally don't buy a nursing bra until your milk comes in, because your breast will get bigger! If you really want to be prepared I'd suggest buying 1 and even 2 cups bigger than what you are at the moment. All of the bras have plenty of hooks so you can adjust them as you get smaller.
Feeding bras tend to come in non underwired so you're not at risk of having blocked milk ducts, and these are all I sell. However, they are available in the region of £26 onwards.
I hope this has helped some of you. If you have any questions about bras or feeding I'd be happy to help.