That sounds like the right move. There really isn't a HUGE difference between those two blowers. Slap the 3.15 on and find a 3.33 just in case.
For a $1200 difference I'd make the jump too, in fact reading this post tempts me.The V1 is the only "HD" gear box. The V2 is still standard duty, but has oil lines. Officially it's also rated at 52k max impeller speed just like the V3 self contained.
The Ti is good for 800whp no problem. I don't see any need or point in spending $3k for a head unit I can't make use of when it'll only cost me $1200 to upgrade mine to a Ti and have more than what I need already.