You might want to consider making/buying a couple of movable bass trap panels that you can use to tame some of the reflections when you record. I built 6 2'x4'x4" panels for under $250 (including the rather high freight charge for shipping the rockwool to me).
I've been doing all my acoustic (and vocal) recording with the modestly-priced AKG P220 (previous generation to this one:
http://www.sweetwater.com/store/detail/P220 ) which is a pretty good bargain right now at $130.