Don,
I used Thunderhead 125' s & 100' s for years, they are awesome. Tough, accurate, and scary sharp. I didn' t like the way that the O ring mated up when I switched to carbons though, and the UBAR' s caused mis-alignment, so I went with Wasp & Muzzys. All three brands are great heads and should do a good job with whatever you put them through.
Charlie