I really like the Highwaydirtbike hand guards. Their Next gen design does not require the use of the top clamp as compared to the older design. I've personally "tested" the strength of the system too many times and it's amazing how strong they are. Paul is a great guy to deal with as well.
here's a linky
http://www.highwaydirtbikes.com/HDB_Sho ... =NexGen_00" onclick="window.open(this.href);return false;
Good luck
Garrett