I definitely think you made the right decision. That 6.0L and 6L90E may not be monsters but they sure are reliable, and with a tune they can be fairly snappy. My buddy just picked up a left over 16 dmax, LT2, same color as yours. I rode in it last weekend and just absolutely fell in love. The interiors and the ride are amazing.
He went 3 or 4 turns on the t-bars, fit 305/55/20 Cooper Stt's on the stock 20's. Like you said though, he still has about 2" of rake on his and he is considering taking out the rear block. He only has a 7' door at the house so he really doesn't want to go up more. I just can't believe how big those new HD's are though, it is awesome!
Congrats!!!