I still have the air dam on my truck. Didn't have any need to remove it.... I'm not sure if they've changed between the '12's and 13's though.
There's tons of larger pictures in both my lift thread and my wheel/tire thread linked in my signature below. You should be able to see everything you're looking for there. In the wheel/tire thread I was only running a 2.5" level as well so that would be a similar set up to what you're looking at. I just had bigger wheels and tires as well.
The truck handles just as well if not better with the lift (since I added the Bilsteins to the front as well). Obviously I have to take it a little slower around sharp corners now because of the increase center of gravity... but other than that it's awesome; really nice and smooth.
Thanks for the compliments as well!!
I know what you mean about modding.... my friends and family rag on me about it quite often too. Bought a brand new truck 10 months ago and I've put over 10 grand of parts into it since then. There's definitely people out there who think we're crazy, but they just don't understand.
As gonefishin said. The Bilstein install is fairly simple to do. If you can rent a few tools (mainly a spring compressor) you'll have no problem doing it. You'll save a couple hundred bucks as well which is always nice.