Mastering CD for Americana, Mostly Acoustic Group

I'm putting the finishing touches (hopefully) on a 13 or 14 song CD for the 4-piece band I play with. Two acoustic guitars (rhythm and lead), dobro or lap steel, electric bass. Mostly original tunes with several covers. Our ideal/wish list mastering studio would probably be Airshow in Maryland. I'm waiting for the band to (finally) sign off on the mixes before contacting them, but anticipate that they will be pretty far out of our budget (which is not yet nailed down). Any recommendations for mastering studios and engineers who tend toward this kind of material? Really looking for a qualified mastering engineer working out of a decent room. You can get a feel for the kind of stuff we do here:

The Free Rangers

although these are early demo recordings from when we were a 5 piece (mandolin player is no longer with us).



Thanks for any help.

Mastering CD for Americana, Mostly Acoustic Group