Honestly a stage `1 flash is much better for the car and driver. A stage 1 flash gets rid of the crappy stock map, gets a little increase in power, and you can get better MPG from it. Or you can save up for the both and do them at the same time.
Who told you to stay away from Turbo-xs and for what reasons? The only thing I can think of is they were trying to sell you on something else. The turbo-xs quality is as good, if not better than Perrin. It may be a little louder than the Perrin but I haven't heard their new setup with the resonator.