Well, I'd also recomend looking for a good used bow or a lower end custom. For $300 to $400 you can get a darned nice bow. If you look long and hard, you could spend half that.
That said, you asked about the Martin and Bear bows....I'm kinda like Curveman in that I appreciate the looks and craftsmanship of any bow as much as it's performance. I've never shot either the Martin Savanah or the Bear Montanna but I've looked them over, strung them up and pulled them both. Without a doubt, the craftsmanship is about three times greater in the Martin bow. However, it's about twice the price of the Montanna....
The other option is to buy the Montanna and a couple files, rasps and sandpaper and finish building it. To me, it just looks like a bow nearly fresh out to the press. Nothing much is smoothed out, blended etc. The tip overlays are four times bigger than they need to be and the handle isn't rounded out very well. There have been quite a few guys here who have "refinished" a montanna and turned it into a pretty darned nice bow. I'm thinking about getting one for my daughter in the future and making it "purty" for her.
Comparing the draw, I thought the Martin was smoother but I pull about 31-32 inches. The Martin Savannah does have more reflex deflex also so it makes sense that it would be a little smoother and maybe a little faster.
Lastly, you're from Indiana I see. Wait till July and head to Marshall, MO and go to Mojam with about 3 days to burn and you could easily go home with a selfbow of your very own making for almost free. If you don't count the cost of sweat equity and believe me, when it comes to Mojam, there's usually no shortage of sweat.... Take something to trade or cut your own osage ahead of time, pick up a drawknife from an antique store, a 4 in one rasp and a cabinet scraper and you'll be set. Read Dean Torges "Hunting the osage bow" ahead of time and you'll likely find you have yourself a whole nuther hobby coming on strong.