So you are 16. My first question would be have you quit growing yet?? If not you should look into the adjustable bows that you don't have to purchase mods or cams for such as like the diamonds. Although it won't matter much as you can only go up a 1/2 inch to 30" in the diamond models. Not sure who else is making the easy adjustable bows but the diamond line is an excellent choice for entry level and even the experienced level. With a razor edge your limited to the 60lb and since you are 180 and 6' 3" I'd think ud easily be in the 60-70lb bow category depending on what your shoulders are like. Ur gonna use muscles uve never used before so much in pulling a bow back. They are a nice bow but for an adult you might try something a little beefier besides your gonna want to set the bow up with good stuff and not that kit stuff that comes on the razor edge. So ur looking at another 150-200 for a sight and rest. so you are gonna be near that 4-500 mark by the time you get done. You could try looking on archerytalk.com in the classifieds. Tons of one and two year old bows on their for a fraction of the regular price and you could probably find a solid setup on something like the diamond iceman for around your $500. They are an excellent bow. This is the second season I've been shooting mine. Other two of diamonds great bows are the stud and black ice. Anyways there is tons of great bows for great prices on archerytalk, even some of the high end bows by various companies go pretty cheap.