Hmm well, i know very little about the VQ35, id emagen itd be very expensive to tune one with twin turbos??
A 2jz with loom can be picked up for under £1k, add a few more K max for box, turbo, ecu etc etc and you have 550-600 hp. Thatl be with stock pistons, rings bearings etc and very very reliable.
My other option befor i got my hart set on the sound of the external gated JZ engine was the LS v8 engines, wich, tbh is still an option.
You may have seen this already but ill post it anyway
http://www.2jzswap.com/vbulletin/