I agree with billc. I wouldn't purchase a brand name bow unless of course, you have shot the bow and you like the it. Shoot as many as you can, and see what feels good to you.
I would recommend for a first bow, something that has a forgiving brace height (7" or greater), and a smooth draw with a good valley with a rock solid back wall. Many of these speed bows with the narrow braces and nasty draw cycle are tricky to master even with experienced archers....Also as a last thought, make sure you select a draw weight that is reasonable. I see way too many archers try and shoot poundage way beyond what they can comfortably and quietly draw.