Unless your going to use an 18R-G head, with side draughts or EFI and a nice set of extractors, I recommend a 5k.
5K = Big brother to the 4K. Bolts straight in. Unlike the 18r. Able to be registered without engineering or mod plating, unlike the 18r.
5k's are getting more common these days. Cam it, Carb it, Extractors, 1.75-2" exhaust, HD clutch. Shouldnt have any problems keeping up with traffic.
Then again, it all comes down to the driver.
As for the text talk, If I tork lyk dis cn peepl undastan me beta?