I would suggest an edge ez.
I have a edge comp that I just hooked up but didn't tap the pump wire. Without tapping the wire it is the same as the edge ez. This box made a world of difference is the performance of the truck. Where the box helped the most was on low end, a real kick in the pants! There are a lot of other brand of boxes out there also that are probably just as good but I like my comp in ez mode! but it probably won't stay that way for long!
As far as voiding your warranty, any power upgrade could possibly void your warranty, but I think if you leave the pump wire alone, you should stand a better chance of keeping your warranty intact. You shouldn't have to upgrade your drivetrain with this box either, but I would suggest a good set of gauges. (Fuel Presure, exhaut temp, boost, trany temp also since you have an auto. )