Welcome! I had an opportunity to drive the IS F before it's public release at Laguna Seca several times. It sure is a fun car on the big track.
As for what to what you're looking for, the car is going to be a rare find if you're in CA. Some dealerships have a few in stock. You are going to find a typical Mark Levinson and Navigation packaged car with a sticker price under $62k. As for making it go, stop and turn faster, you can add an intake and exhaust, upgrade the brake pads or brakes all together and add larger wheels/tires like any other car out there.
Good luck.