i was in same position as you last year.... but r33 gtst's and 32gtr's had a big price difference so i went the R33 thinking its cheaper & also newer. dont get me wrong it probaly was (untill the modding stage lol).
but after a year ive upgraded to a 32 gtr. i think its worth it to go the GTR straight away man, but yeah u do have to find a nice example to avoid any major troubles..
pro i found with the r33 was that i didnt feel i was in the 1980's wen i was inside the car lol, and it was a much cheaper to maintain one, nothing really went wrong that i didnt cause myself. but yeah the 2wd starts to get annoying after a while. id say its the most reliable car i had.
with the gtr. its an experience u need to see for yourself. it shudnt be HEAPS more expensive then a gts-t in my opinion, u jus need to follow a strict religious servicing schedule.
oh and most skylines have been winded back dont trust wat u see on the clock. make your own opinion of how many km on it.
the cons i cant really remember lol as i've had a very good experience owning my lines' cant really say anything wrong about them except air/fuel ratios!
good to hear your looking at a line, wen i get my next car its deff gna be another RB.
hope that helps matey