Congratulations! If I were you, I'd leave the appearance alone, maybe a few tweaks, a Denali can carry those chrome-plated trims well. Does it have a 6.2l? FFV?
I'm a bit surprised that you didn't get a better deal especially down south in TX-LA area. I bought my '15 GMC Sierra 1500 last December in Birmingham AL and I got 27% off MSRP with minimum effort.