There was an article in a recent Aussie car magazine testing the R34 up against the current 996 turbo. 996 was stock, GTR had some minor intake mods. R34 was faster in most of the areas, but when it came down to overall track performance, the writer picked the 996 as the better racer (although here it's R34 A$110,000, 996TT A$360,000 !!!). The choice was made mainly as the 911 could've repeated the circuit test time and time again, but the GTR was a little wrung out - otherwise close performance all around. I'll see if I can find it and post a copy.
The R32s use to race in the touring car series here is Aust - very potent, very effective machines, beating all comers (mainly V8 Holdens and Fords).
http://www.fullboost.com.au/articles/reviews/cars/r32_review.html
I love my porsche, and given the choice it would always be 911s all the way - there is nothing else that gives the same feeling IMO, but you gotta respect the ability of these GTRs. A step above all the other imports we get over here.
Ash