Once again guys i ask for your expertise

Am loving this new V6 sti (and am very slowly being converted from the V8 brigade ), but one thing it needs is a decent tune. Its running a little rich (you can smell it) and every now and then when slowing down for lights it tends to stall.

Who in perth would be a good mob to get a tune from, and what are the tunes worth (I know LS1 tuning was usually $400 - $700) but is the wrx a completely different kettle of fish?? I know there is posts here listing tuners but im asking for personal experience and what other people have done, regretted, ect

The car has 3" hitech TBE, turbosmart BOV, Autronix computer and intercooler water spray kit as mechanical engine mods.. It has stock VF28 STi turbo.
Whats the next step for a little bit more poke... once again ide like to explain i have NO idea about modding wrx's i have come from a history of V8s and stroked LS1's