06 GMC lowering suggestions

Jus picked up a low mileage 06 GMC dually and the first order of biz is to order a lowering kit. Need some feed back from all of you pros out there. I have had bagged duallys before but don't think I want to go that low on this one...I was thinkn 3-5, 4-6 or 5-7. Don't tow anything so bags and c-notch aren't really needed just want it to sit nice with some 16" chrome rockstar rims on it.

Can I get some .02 from the pros............on which kit and who's brands are not junk

DJM is the best I have used for the cost of the product.