I have also had a "flash" tune, and a "custom" tune. I honestly can't say I could tell a difference between the two. In fact, I had my flash tune done right before going to the Dragon. I couldn't tell any difference.

Now, that's not all the info though. I was having boost leak problems at the time too, so I'm sure that detracted from the whole setup.

I believe I have the boost leak problems fixed, but I'm still getting less performance than I think I should. Mine dynoed at 353 whp and 353 torque. That's with all the mods listed in my signature, including the custom tune.

It's odd, since Mimi05SRT6 right above has the same pulley as me, and a tune from the same company as me, he also has a CAI (not the same brand but what the heck). The major differences between our cars is that I have the intake manifolds, he doesn't, and he has a magnaflow exhaust and I don't.

Yet compare the hp numbers and the drag times. He's putting down 340 whp and 330 tq and getting 12.1 ETs. I'm putting down 353 whp and 353 tq, and getting 12.5 ETs. Hmmmm...

Anyway, back to the OP's original question:
You're right, there are basically two brands of ECU tuning for our cars: LET/Eurocharged and InMotion. Sure you can get one from RENNtech or EVOsport, but you'll pay through the nose.