I am also working on finding a deal on a Selin Translator. I'm assuming with your Ash ECU you are at least running boost jets, if not do that or an EBC before any of the above.
I agree that IC piping would be way down the line vs intake/exhaust mods. Flywheel is great too but can wait till next time you drop tranny for something.
Oh and all of the parts I mentioned were bought used from reputable sellers on TT.net - the best way to save $ on parts that don't really wear out (DPs/TPs/ICs).