If you'd like change from your $500-600 go to Boostworx & if your not entirely happy with the tune & don't have a datalogit take it back. Shaun is more than willing to give it a blast around the block to fine tune it some more . Like many others here there's nothing but, praise for Shaun & Troy's work.
Not saying you'll get the same quote, but when I had the initial full tune w/ bigger injectors, upgraded AFM, fuel reg & re-do hi-lo boost settings it was around the same mark. Know for a fact another respected workshop, which I also go to charges quite a bit more to add extra boost settings & play around with fuel pressure etc.