you really need to go somewhere where you can draw your bow with an uncut arrow on it to figure how long you want it. Unless, somebody on here with the same spec'd GTO can help you out. Otherwise your basically guessing at what length arrow you need. With that in mind, you gotta figure out how much you want to spend. 340 spine is probably the range you'll be in for that weight, from there you can pick the weight arrow you want. I shoot Easton ST Epic's and for the price they are hard to beat and i have them fletched with 2" blazer vanes. It doesn't cost much to get arrows cut so i wouldn't spend money on a saw unless you plan on opening a shop.