I agree with reddogge. GT 3555's should work for you. If you're going to cut the 3555's yourself, you will need a cutting tool. Some people use utility tools like Dremels, but I wonder how they get a 90 degree cutoff. You can get a good right angle with a cutoff tool designed for cutting carbon arrows, but that's extra money I don't know if you're prepared to spend.
You could just ask for the shafts to be cut to 29". I cut all my GT shafts to 29", even though I have a cutting tool. In addition to the 50 gr brass inserts recommended by reddogge, you should order some 20 gr brass inserts, and some nock adapters that will allow you to put additional weight on the nock end if need be. If you need to stiffen the shaft, you add weight to the nock; if you need to weaken the shaft, you add weight to the point. I have tuned 3555 GT's for all of my bows in your weight range by various combinations of point and nock weight.
With the right combination of weights, you should be able to tune a 29" GT 3555 to work with your bow, and use a 150 grain broadhead. That means you will be using 145 grain tips to practice with, which is probably work okay because you will probably sharpen off about 5 grains from the broadheads anyway.