I say go 8" all the way.. Untill your hitting like 600+ rwhp i think 10 is just a waste and its much harder on everything.
I went from 2.20 60' with my 17's with 315/35 nitto's to low 1.5's with my 8" MT's at like 15+ psi. And if i had more motor the 60's would have kept on dropping. They may not look as cool but they will get the job done with less problems.