[ QUOTE ]
Why do I care about noise, my arrow will be there before the deer hears it anyway, especially if you are over 300 fps
[/ QUOTE ]
Unfortunately, this is a common misconception. The speed of sound is 1128 ft/sec so the sound will definitely get there before the arrow. It has been proven that a deer can easily duck a 300+ FPS arrow even inside 20 yards. Point being, a quiet bow is extremely important as you can't outshoot the noise. Whether you shoot 60# or 70# is up to you, if you can easily handle the 70 then go for it!
A 60# bow will shoot the exact same arrow 12-20 FPS slower than a similarly equipped 70# bow. In jumping to 70# you will probably have to use a stiffer arrow which can weigh from 27-42 grains more and that extra arrow weight will slow that 70#er down from 9-14 fps. so basically, a 70# bow with properly spined arrows will be less than 10 FPS faster that a 60#er. You will have more kinetic energy with the 70#er and heavy arrows but for must of us and what we hunt, we have more than enough kinetic energy. And don't forget, a 50-60# bow set at 60# will be faster and quieter than a 60-70# bow set at 60#.
Sales here are pretty much evenly split between 60 and 70# bows. I hate seeing someone buy a 70# bow just because they think they are wussing out by getting the 60, its just not true. Plenty of people can easily handle 70# bows but we've all seen plenty of examples of people shooting too much weight and struggling to pull it back or having to "sky" the bow to get it drawn. Try this test, sit flat on the ground with your feet straight out in front of you and pull your bow back very slowly and straight out, not skying it upwards. If it's a struggle you are probably overbowed and may benefit from a little less poundage.
Sorry this is so long, just wanted to get the facts out in front of people so they can make their own informed decision on the right bow for them. Don't get what your buddy bought or buy one just because of an ad or commercial without trying to find the perfect bow for you. Bow fit and feel and the right bow for you is a very individual thing, try several and get what "you" like.