How to record violin, viola, steel pan, bass, & keys che

I'm in a new band and we'd like to record a simple demo. Our orchestration is violin, viola, steel pan, bass, and keys (I'm playing only keyboards now; no acoustic keyboard instruments yet).

So: what do you think we need to make this demo work? We don't practice on system, so we're good at balancing by ourselves (that is to say: I'm hoping (for our first thing) we can get away with not giving each instrument its own track).

This is what I'm hoping:

A nice condenser mic (what kind?) for the instruments and a tight dynamic cardioid mic ( probably SM58 ) for the vocals. Run it all through an Mbox into Pro Tools.

What do you think?