First of all, the last place you should be thinking about buying your first compound is through a catalog. Trust me, it's a mistake.
Go to a bowshop. They can fit the bow to you. But then again, there's another problem. You need to decide if you will use fingers or a release, to get the proper draw length. So be sure to buy a bow that you can easily adjust the drawlength incase you decide to switch the way you loose an arrow.
Also, if you plan on using the bow for hunting, I would stay away from the speed bows. They are stricly for the experienced. They are tough enough to shoot in competition, let alone scrunched up in a tree stand all bundled up in hunting clothes.
Look for a bow that is D shaped (called a D flex design). In other words, the spot where you grip the bow is forward, out under the limb pivots. A D flex bow will have a long brace height (the distance between the string and the handle) and be MUCH MORE FORGIVING for hunting. And you want a forgiving bow for hunting. Shooting arrows with broadheads is not the same as shooting arrows with target tips. Tiny mistakes in tuning and shooting form are magnified with reflex bows. The result is missed shots. Go with a D flex. Also, avoid overdraws and short, axle-to-axle lengths. Both are less forgiving. Do you want to shoot fast arrows or consistently accurate ones?
If these terms sound vague, then you need to educate yourself. Hang out at archery shops for a while before buying. Talk to others and see what they are shooting. But beware! Everyone thinks their bow is the greatest, especially if they paid over $300 for it.
Before even thinking about buying, I highly recommend reading Chuck Adams' book on bowhunting. He has years of experience and lots of good advice.
And above all, don't take your bow in the woods until you are prepared as a hunter. The last thing you want to do is wound an animal due to shear lack of preparedness. You will regret it, believe me.
Happy shooting!
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Hoodoo
Why dost thou whet thy knife so earnestly?
The Merchant of Venice, Act IV. Scene I.