I don't wish to be the voice of doom, because I know how utterly depressingly unattractive most nursing bras are, but I don't think you should spend good money at this stage, not until you know what size your are going to be.
Against all advice, I think unwired nursing bras are fine after about six weeks or so, once your supply has got into some kind of rhythm. However, in the early weeks, you are taking big risks with the wiring pressing on you in the wrong places, causing blockages when you have so much milk, and possibly leading to very painful infections.
I'll give you my own example -
32dd before pregnancy
32e at 32ish weeks
34g (yes, G!) until my baby was 6 weeks old
back down slowly through 34 e etc by about six months
still feeding at 3.5 years old, using ordinary under wired bras for most of that, but 32 e until about 6 months ago.
You have no idea yet what size you are going to be. Maybe get one or two non wired bras for the first few weeks, then get some decent pretty ones once your supply has settled down.