I would say if you're going with those Roland TD 20 digital drum set, screw the guitar and vocal booth. You just need a GOBo, with a window in it, placed in front of the vocalist. And that will cost you virtually nothing. I like open rooms and I don't like booths. Who wants anything recorded in a phone booth? I know I don't. So it's microphone selection more than anything else. Condenser microphones on the vocal may not cut it but a dynamic will. There is no loss of quality when cutting a vocal with a dynamic microphone of the right type. Dynamic microphones definitely have their place in smaller more cramped areas. Like, Greece.
Calamari lover, Greek style. Love that octopus also.
Mx. Remy Ann David