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Nothen beats custom LS1 tuning. But, I would think the Predator would be best hand held unit available.
I can get you my Superchips VERY reasonable that is brand new used only to get my car to the tuning shop. If you can find out if you can get it sent to them to get custom work done, I would be happy to give it to you for a GREAT price.
Jon
check out the VHP tuner before buying the predator. here's a tutorial i made for VHP http://www.stealthram.com/vhptuner.htm i picked up .2 and 1.4 mph in the 1/4mph.