Like Mike said, I have a hard enough time with oil and fuel at high-G's, I don't need meth too. Plus, meth injection is illegal in SCCA (though water injection is legal... I tried that and keeping the system primed and working at the track is a headach, especially when you get more gain just from running 100 oct).
Which reminds me, I've got a full Aquamist 2D system with a spec-C tank if anyone wants to go to meth injection that isn't tracking their car.
Back to the turbos... I didn't know about the non-rotated GT3071.82R. That might be a decent option... but it depends on the cost. If it's in the $2000 range, I might as well just go with the rotated setup. Since I'm MAP based, it would be nice to run a big-ass 4" inntake from the fender to the turbo and not deal with the smaller inlet hose. The only reason I'd stay with a stock turbo location is if I can get a deal on a used turbo like dayofpain's which is an adequate turbo for my needs and has low mileage on it.