I am a huge fan of the Jagged spikes since it does considerable damage when it crits for me (Currently level 58, It gets to about 6K Crits, mainly stacked crit damage bonus with 2h xbow).
One thing I guess I just realized is, the Crits from Caltrops doesn't remove the Sharpshooter Crit Buff, but gets the benefits of it. So for fun I've been spamming Caltrops with the buff up to pretty much decimate whatever I want.
Kind of silly but quite effective. Just about finishing up Act 4 Hell right now so this would most likely lose a lot of effectiveness in Inferno but still it's pretty nice.