I would forget about speed. These old traditional bows, all of them mentioned, shoot fast enough for hunting. As far as your question, there are too many variables, such as string/brace length, string material, arrow weight, draw length, etc. Look for a nice quality old bow, in good condition, straight limbs, no delaminations, etc., get a Dacron B-50 string, some properly spined arrows and have fun. 10 or 15 FPS one way or another doesn't matter much if you like the bow and enjoy shooting it.