I've been shooting 40-45# bows for a bunch of years; my preference is always wood (so far, anyway). I can rarely get a 10GPP arrow with either spruce, cedar, or doug fir. That's with 125grn heads, and a light finish of tung oil. I end up shooting 10.5 or 11gpp at best.
I always ask for the lightest (premium) shafts, preferring a flatter trajectory out to 20+ yards. You'd have no trouble whatsoever getting a heavier arrow if you're open to wood shafts, but my preference would be staying with 10GPP.