The V8 R8 starts at the $115k you mentioned. A new GTR costs $85k since Nissan has been offering the dealer cash. Some people have bought as low as $81k that I know of. So a V10 R8 is A LOT more expensive than a GTR. The GTR is bang for your buck.
Yes there will be a re-design for the R36. It should be out as a 2018 model (or that's what the rumors are now). And it will prob rise dramatically in price since it will be a hybrid of some sort.