I dont think you can go wrong with a UR35R kit. you'd really be surprised how much fun that turbo is on the stock block+race gas. It is reasonable to expect 550whp (depending on the dyno) and contain enough potential to run 10's.....that doesnt mean it will happen.
I have personally trapped 101mph+ in the 8th and 129mph in the qtr on a 550whp UR35r setup. you have to make a drastic investment into a setup to see results that are marginally better imo. several new weak links start to rear teh ugly head once you try to go beyond those levels, fueling issues, clutch, axles, driveability, and reliability.
do you want a garage monster that has tons of whoop azz, but only runs 6 months out of the year, or do you want a tamed yet angry creature (stock sti+35r+supporting mods) that has enough umph to walk a stock C6Z06/viper from a roll?
I'm not trying to talk you out of a 16k monster build, they are quit rewarding (hopefully
), but I'd take this project in steps, cause you might decide you are pretty happy without selling the farm.