Aftermarket injectors are getting cheaper, secondhand drop in items for 33's pop up on the forums all the time.
Turbo won't be excellent, but will still be fun and make the numbers while you strip down the RB30E ready for the bottom end swap (it's not that hard, I did mine in a weekend - do a lot of research and purchasing before you commence though.. head gasket, vct mod, oiling mods). Has been known to fit with a spacer but most people go the 3076 as a good match for the rb25. Maybe look for a .63 rear..
If the car you're looking is forged already, with good tuning and maintenance the bottom end should live a long healthy life - giving you lots of time to build a bulletproof 30 bottom end
Spare parts wise, heaps of kids crash them - parts are everywhere and reasonably priced. Lots of stuff on the forums.
Summary: Do it. Skylines are much more fun than VL's! And have a good search of this site, it's a fountain of knowledge!