allmotaeg6

I'm currently in the market for a new transmission for my b-series. Currently best time to date is 11.60 @117 cutting 1.63 60' on 23-8-13 m&h's on a stock us gsr transmission no lsd.Motor makes 250.64 whp with 165.95 tq rev limit is at 9500 rpm

Would i benefit from a jdm itr with a transmission with a upgraded fd(ats 4.9)or would i be better off just getting a itr or b16 trans with a 4.7? Any input would be great