LS1 PCM Choices - Help please

[GeoffP]

I'm astounded at the myriad of choices for GM PCM's for LS1 engines. I wasn't expecting there to be so many different options or those options to have so many variances. Can someone point me to some online reference for GM PCM's for LS1 engines or help describe the differences? This will be going in to my 68 Camaro with the planned engine and transmission being an iron block LS1 and T56 transmission. I won't need a custom harness as I plan to use an OE harness and adapt it to the car as I have with all the LT1's I've installed over the years. The engine has a 24x reluctor so I understand that limits me to all PCM's produced up to the E40 that went in the early LS2 GTO's. I know I want to use a drive by wire throttle and I would like to get the cruise working (properly!). Any gotcha's or suggestions will be GREATLY appreciated. I plan to go with a mail order tune initially to take care of VATS (or otherwise) and then drive it someplace to have the engine tuned if needed.

BTW I have already used the SEARCH feature both here and LS1Tech and have not found the info I'm looking for.

Thanks in advance!