First off, you're going to have a LOT of smoke- the BD120s are not a clean injector. But you already have them, so why not go with them.
When combined with a Comp, you'll not only need a clutch and fuel line upgrade (highly recommend Wildcat's Max Flow), but a minimum of an upgraded turbo (Dodgezilla, PDR40, or KSB1-B) and a pusher pump (carter, aeromotive/PE4100, FASS/Preporator).
While I see nothing wrong with the COMP, per se (maybe too much timing), I would strongly consider the TST Powermax competition box. It's very aggressive and will certainly give you all the fuel you can handle for now. It's also cheaper- and they word is that it's a hair more reliable too. I say a hair, because generally both the Edge and TST boxes are very reliable, with perhaps the TST having a slightly better record. Most of the issues with Edge boxes are monor things like burned out LEDs and such.
The other reason I would push the TST is that the extra timing of the COMP is not as good on the HO engines. The higher compression ratio and higher injection pressures of the HOs mean the engine's under more stress and that the engine needs less timing.
It depends IMHO on whether or not you plan on loading the truck up heavily-- like pushing max GVWR. If not, the comp is perfectly fine I'd say. But if you're going to be towing really heavy, you want to play it safe and forfeit the extra timing.
When I tap the wire, my EZ will be up for sale. And I never tow. No stacking for me.
Justin