Nothing too crazy, but I'm beginning work on a custom tune today with "DiabLew" who is a well-regarded GM remote tuner for DiabloSport.
http://www.diablewtune.com/
More than anything, this is just to make tweaks/adjustments to the canned Diablo AFE 93 tune I'm currently running to maximize it for my exact setup and gas. The fact he includes free retunes for a year is a huge bonus too for when my ported manifolds arrive from MAP
I've looked into a custom dyno tune @ LG Motorsports with HPTuners, but I just do not want to lose the flexibility of the handheld and being able to go back to stock, switch to a 91-octane tune, etc. whenever I need. I also like how the Diablo remains invisible to the dealership once you go back to stock (this is a huge plus due to the 5/100 powertrain warranty).