I've been interested in putting together a fighter or ranger with a repeating heavy crossbow (from SRD: Exotic, 400 gp, 1d8/1d10, 19–20/x2, 120 ft., 12 lb., Piercing) which takes a lot of money and a feat to burn (thus the fighter class, at least for a couple levels).
But the idea of five 1d10...