welcome to the forum. I looked into the threshold at some point as well. I'm not sure how much its going for. But if its in the 250 range you may want to look into bear's game over bow, my buddy got one on ebay new for 265, it was an 09 model, but its pretty fast, and quiet. My father inlaw bought one as well and love it. Not sure how light the limbs will go, theirs are 55-70, but they probably have a 50-60lb set up as well. Its the cheapest best quality/value I have found. If my draw length was longer I would shoot one all day long, really nice set up. You can also look on ebay for used bows, you take a risk of something being wrong with them, but sometimes you hit the jackpot. I picked up an 06 bowtech equalizer for 225, with 220 dollars worth of accessories. Its quiet, and fast for my setup.
My best advice is read reviews, see what people are saying about the bow you decide on, and shoot as many as you can. If there are reports of cracked limbs or other recurrent issues be careful.
"If Darwin saw the same sunrise and sunset, that I see from a duck marsh, or my tree stand; then he would know there is a God, and that He created all of it." -Ford-