If you get a programmer, atleast get an email tune. The canned one is not a good way to go in my opinion. www.rwtd.com or www.injectedracing.com can do custom tunes for Diablosport Predators for about $75 and email them to you. You email them the stock tune from your car's computer and they tailor it to your mods. I got mine from rwtd and althought he took his sweet ass time doing the tune, it was noticably better then the canned one that came on the Predator from the factory.
I'd go SCT Xcal2 or Predator and MM subframes if I were you.
I know subframes don't sound like a really exciting mod, but trust me, the subframes will put more of your power to the ground and will actually make your car feel like you have gained some horsepower because your chassis wont be flexing so much.
well it sounds like subframes and most suspension mods are for leavin the line better, but i have never been to the track, and might go once but not much. most of the racing i do is from a roll with random people around town. so i never need to leave the line better, just have more horsepower.