Hi Username,
If your preference is Dtech - that is great, they are amongst the top tuners in NZ, and one of the few other shops i'd be confident enough to take my own car to.
I do know we are slightly more expensive than Dtech, our pricing is based on our local competitors (If we wanted to make oodles of money, we wouldn't have chosen the motorsport/performance game, we'd be building houses or something). In our neighbourhood we charge similar to our competitors but attempt to provide a higher level of customer service, support, courtesy cars, event/club sponsorship (including the CS 2017 Calendar) and more stuff to come.
A full PBMS tune, includes a comprehensive pre-tune inspection (taking upto an hour and a half) to test all the basics, static fuel flow, intake system pressure leaks, setup of fuel pressure (if required), setup of ECU etc, then an entire day on the dyno, then a cold start tune, finally a road tune/adjustment is $1200+GST/$1380inc. We could most certainly pump tunes out in half the time, without inspection for $800, and have them 60% as good, then get a bad name real quick - but that ain't what we're about. We're about taking the time required to do a quality/thorough for a fair price, to protect our name and your pride and joy.