I have had really good success with,
(Trophy Ridge) Rocket Steelhead 100's(M)
(Trophy Ridge) Rocket Ultimate Steel & Ultimate Titanium 100's(FB)
Grim Reaper Razorcuts 100 (M)
G5 Montec 100's(FB)
G5 Tekan II 100's (M)

I am going to try the new Undertaker head as well from Trophy Ridge. My buddies and I will usually all get a couple of different packs of BH's each that way we can all try out 6 or 8 different heads and we only have to spend about $50-$70 each but we have a good variety to experiment with and then buy what works best. I ask guys at the shopI hear talking about what they used to shoot if they have any old ones in good condition I could try as well, you would be surprised how many peopleswitch heads every season or twice a seaon for some. I have sampled quite a few like this. Matter of fact if you want to try some of the Montec G5's or RocketUltimateSteels I could probably send you a couple.