I had my r33 to a fairly good level, did some good lap times in it, but I was at that point where it was a stock motor with plenty of bolt ons, no cage, basic brakes, still was fairly cheap to get to that stage.
Id have to spend another 15k easy to get more out of it.
for events like superlap and supersprints it would have been good.
I like Ryans idea. Stick with RB20 - learn the basics, get out there and have fun!
Roy in VIC has a very quick and competitive RB20 gtst, stick with the rb20 for a bit, on the side, build a rb26!