Acoustic Zen Krakatoa at around that price is unbeatable! I have the Krakatoa and Tsunami's, and they're great compared to others I've sold.
These things are very system dependent. I didn't like the vipers on my vk60. (vk50se with wp6's). I did like the Fim Gold and the Kimber Palladian. Trans Ref XL great to. I did like the Viper on my Muse 9 sig.
Also, if you haven't done this...dedicated 20amp line a must w/ the bat gear. Big help...