I'm in the same boat here. I have a stockish R33, with cat back exhaust and pod filter. I recently added a man. boost controller. I also want a quick street car, for the odd track day too, but i'll be adding a FMIC and dump soon. I'm probably goin for the JJR ($260) dump and FMIC ($350), both from Just Jap. They're cheap and can do well up to around 300rwkW (i'm advised).
I'd be stoked for a setup where it's economical around town, then i flick a few Power FC switches and i'm peaking 220rwkW. I think that's affordable and reasonable for a daily driver that you want to have fun with