I'm currently running with some Truvativ Firex Giga X Pipe, 44/32/22 cranks (stock with new bike). I've searched the net to try and find some info on these cranks but can't find much. All I could find that this crankset seems to be stock on low to mid-range bikes.

I found a deal for a Shimano XTR FC- M960 crankset reasonably cheap (including installation tools, spacers and b/b) . Is it worth upgrading or would I be better off just upgrading my wheelset? (but really who can turn down a bargain when they see one)

I mainly do cross country but love downhill riding with small jumps/drops just as much (who doesn't?)

any advice or comments would be appreciated.