Go see SSV in oakleigh.
Settle for a R34?? they are heaps better performance wise than an s15 (and looks for that matter, but maybe im being a little bias)
As for the 206kw, thats what they are at the flywheel, the GTR is much more than that, but for various reasons (legal) they (Nissan Japan) had to state that the GTR is 206kw.
Basically, you wont be disspointed with a 34, just ask anyone who owns one.