I would advise against getting a bow on Ebay unless you know a lot about bows and can do set up and maintenance yourself. And How would you know the bow would fit you or not? It sounds like you have a little experience though

.
I think you should look at a Hoyt Ultrasport if you haven't already. That is the one I looked at last summer. I could not a tell a big difference between it and some of the bows for twice the money or more. It should be under 400 bucks. The next step up would be an Ultramag, maybe 50 to 70 dollars more.
There really isn't a big difference between the hoyts and relflex. The biggest difference is that the technology is about a year behind the hoyts and they can sell them mail order where you can't hoyt. Other then that they are pretty much the same. The risers might be slightly different as well.
Unfortunately I think bows cost more than a rifle. I would not spend any were near what I spent on my bow on a rifle. I could get a decent rifle and scope for half what my bow cost. Archery is expensive. And the little things add up quick. Rest, sight, arrows, target, release, stabilizer.
Good luck with what ever you decide.
Paul