As the guys have mentioned above ... C34 all the way.
Mine is a series 2, so shares the same RB25DET Neo motor the R34 has. Mine was tiptronic auto, but I've since converted it to manual. The tiptronic box was awesome with a shift kit ... I just preferred manual.
Heaps of room in the back ... I've used my stagea for lots of dirt owrk, large hauling, and interstate trips galore. Great bang for buck for what it offers, and for mods too.
Do it!