yes, mixing a large condenser mic with a direct contact sound (preferably preamped) will sound GREAT. I did that once, back when I had a Tascam cassette 8-track.
Instead of buying that Martin, use the money on an upright bass and get this:
http://www.music123.com/Dean-EAB-Acoustic-Electric-Bass-519943-i1150843.Music123
it's
Dean EAB Acoustic Bass Guitar (ABG) - although cheap and laminated, it's by far the loudest (acoustically) ABG of all the ones I tried (except Tacoma Thunderchief and their laminated half-sister Olympia). It's really huge, but postured properly not hard to play. And sounds pretty good.
I got mine even cheaper, as a "blem". I had to send the first one back, because there was something wrong with the neck, waited a few months, saw another blem and grabbed it for $129 shipped. These days they also run coupon codes with more discount off blems. If you no like, you send back
I've tried Martin SP phosphor bronze ABG strings on it as well as flatwounds, both sound great, depending on what you want. I figured the bright bronzes cut through better. The passive pickup is "ok", but NEEDS to be preamped. Don't forget to throw away stock strings as soon as you decide that everything is fine with it
Just FYI, I've wanted an acoustic bass guitar for maybe 10 years. I've liked the Tacoma Thunderchief for just as long, but was never gonna afford it. I kept trying all ABG's I saw at stores and kept reading about them and when I saw these Deans, read all of the reviews I could find. The problem is: ABG is a weird (and "bastard") instrument, so it's not like there's a few models in each price range. As far as I'm concerned there's only the Dean and the Tacoma (and Olympia), everything else is only useable with an amp. These can hang with a couple of acoustics (though don't expect miracles).