Those with Tuners & Cams in here please??

Well I've had my Comp 270's and springs for about 6 months sitting on the bench (way to busy with Family and Business!) and I've picked up some Flowtech Longtubes with matching X-pipe and I'm having 4:10's installed Wedensday and plan on the header & cam swap over the weekend. I was at the NMRA race in Joliet this weekend and AMP was trying to sell me a Diablo tuner and said it would work well with my plans, ( get the car to idle, take care of O2 sensors, 4:10 gears etc). I talked with T&J Performance and they reccomended staying away from the tuners and they wanted to burn me a chip. I don't care about the last HP, I just want the car to run well and I might spray it at the track someday and would like to be able to knock back the timing without having to change a chip.

Any experience with Diablo, SCT etc.....?

Thanks