RE: Marten Orion?
I don't have any experience with the Orion, but Martin bows in general. It should serve you pretty well. I've got three Martin bows at present. If you take a good look at the different models you'll see something. There really is no "entry level" bow in the line-up. Most of the difference in prices is due to the machining of the risers and limb pockets. The bows share the same limbs, cams, and rigging. That means the Orion may just have the same components as the top-end bows.
I would suggest you shoot a few of them to get a feel. Then make a decision. If you are looking for strictly a hunting bow and some occassional 3D I'd lean more toward the Tru-Arc+ cams. Performance is good and there is more adjustability for tweaking your drawlength, not to mention less trouble with things going out of tune due to string/cable creep, although the Martin strings are pretty good for factory offerings.
Go for it.