Any turbo add-on is not gonna be as relaible as all motor. Your best bet is gonna be to get the H22... the f22 you have will last quite a while longer... but 175K is way too high to put a turbo on... you'd kill the engine.

Get a H22, throw bulletproofing in it (Cylinders, Rods, sleeves, rings, copper head gasket) and some bolt on things (headers, pullies) and maybe cams and gears... You dont have to do all of it, but i'm sure for $3000 you can get a 250HP motor.