I'm currently BM spec for arena, however I have come to enjoy 0/28/33 aka
http://www.wowhead.com/?talent=VZqVbRVzhhZIhb0tcMhV0h while thrill of the hunt is an excellent talnet I believe it needs to be similar to the t3 6piece bonus so that it gives mana back from autoshots, I also have no mana problems so I decided against using it.
I have read that MT is ~3.9% crit on these forums, however I don't find it's worth it since raid buffed i push 42% crit (with druid) without MT.
90% of the time I will be grouped with a feral druid and shaman for goa hitting 106X agil and giving a nice ap buff to the target. with this setup im pushing almost 1200dps with scorpid on fights like mag, and around 900dps on gruul.
I have trialed 5/20/36 and found the haste procs required more effort to keep up the same dps as 0/25/36 or 0/28/33, however I do play with a 400ms ping.
saying this I do around 100 more dps with bm spec but its much more effort to keep up the dps and I rather just be survival and be able to pay extra attention to the fight.