you can do the same thing with a MAP sensor, I tune both work with both.
If it's purely a street car and you're on a budget get Nistune... whatever you do, do not get a PowerFC. If money isn't an issue, get a Haltech, leave your AFM there just use the internal MAP sensor.
Nistune will support R35/HPX AFM, will support flex setups, has launch control supports boost control etc... it's wonderful bit of kit.