The thing with this kind of question, is that it is so flexible or there's no real solid answer. In this community people use all sorts of microphones, from usbs to XLRs. What'll likely be recommended is an XLR with an interface because it is clearer or just generally better than a usb. But if you can't find an xlr and interface with your budget, someone here who is knowledgable in microphones will help you find the best USB mic for your budget.
Another thing to consider is your recording environment, because believe it or not that makes an amazing difference. Maybe look up how to pick a decent recording space as well?
Sorry I didn't give you a good answer. I am not too knowledgable in mics and know their technicalities. I recommend looking up utau and finding their respective microphones used to get a general idea of what the quality will end up being.