WantBuck-
A used bow is a cost effective way to upgrade. I know a lot of guys that buy one every year and unload their old one to compensate for some of the cost. This benefits someone in your shoes. They are getting rid of a perfectly good bow with nothing wrong simply to upgrade.
I would have to agree with everyone here in that the first step is to figure out what your draw length is first and then go from there in your purchase. The 50-60 pound model would be more than sufficient to do the hunting you will do.
The last note is if you are interested, I have a Jennings CK3.5 that I would make you a deal on. I would be able to sell the bow pretty much ready to shoot and hunt with. It comes complete with Sight, rest, quiver, peep, and kisser. Depending on the draw lenghth I might even be able to throw in a dozen arrows. The bow is completely adjustable in draw lenght with modules, so no matter what your length is it would fit you. It is also a 50-60 pount right hand model. I could let it go for $400 complete with the above accessories. If you are interested please let me know and we can go into further detail. Reply here or email me at: [email protected]. Good luck.