HyperTech III Are they worth it? Springs?

[The Rookie]

I have had my 02 SS #5055 for almost 3 years now and have not made a lot of mods to it. It is my Garage baby. I have an SLP lid, K&N filter, SLP Y-Pipe, MagnaFlow Exhaust, Strut tower Brace, KYB AGX Adjustable shocks, Skip shift eliminator, lower control arms and an adjustable panhard rod. I am looking to start making "go fast" mods to it. Is the Hypertech going to do anything for me? Is there something that will give me more bang for the buck? Also, I am going to be lowering it. What springs do all of you recomend? Eibach? Hotchkis?
And I guess while I am at it, if anyone knows, my daily driver is an 04 2500HD 4x4 4dr Duramax. Will the hypertech do anything for it?

[The Rookie]

Sorry everyone just saw the below posts on the Hypertech. So what other reasonable dollar Go Fast mods would you make? Also, where is the Free mods section I keep hearing about?

[Zboner]

http://www.installuniversity.com/install_university/index.htm

go to LSX vehicals and then install documents. everything you need!

[GTObsessor]

Yah... HyperTech dam near did my LS1 in for good... spark plugs had TONS of aluminum on em... really bad sight.

[5150]

hypertech, BOOOOOOOOO! save your money for a profesional tune.

[The Rookie]

Does anyone Know of a tuning shop in Houston, TX where I can have a professional Tune Done? I know of LG Motorsports in Dallas, but I just moved to Houston. What is the normal cost? What can I expect to get out of it? HP? Torque? Both? Thanks in advance for all of your help.