Band or DJ?

We went to look at Russo's last night. Gorgeous, yes, but I don't think I will be having my wedding there. But I did see a band, and I loved it. Mike has to check them out, but I didn't consider a band until last night. I do love live music. I have been to a bajillion concerts in my lifetime. I don't know how I didn't consider it. I am so confused how this goes though. When do I book a hall? Is it too soon?