a sr20 wont really cost to much more then 5gs. You can buy a good runnin SR with gearbox and wiring for round 3gs. Andy does a kit for $550, that gets you mounts for both gearbox and motor, now get someone to wire it up and then get it tuned.
Its all about engineering, thats where the money goes.
A turbo pinto i dont think will get under 5gs especially if you want 200kws.