yeah man... u don't need this thing in your life. you said you're planning on starting a family next year. as most of us know, those things don't just pop out the second you decide you want one. most of us had to try for at least a few months before gold was struck. That said, by the time you've made your 20th payment to GM you'll finally have the #2 reason for getting this thing. (your #1 reason was just plain absurd. since when does owning a house equate to owning an suv?) But anyway... don't be fooled by these numbers. 400hp sounds great and all but at what cost? not only will the mpg suck more than your future baby (in the literal sense or course) but, since it's on a truck frame, it won't have the 'sporty' characteristics necessary in order to make that kind of power fun.
At the very least, I'd wait until you actually have a family. it's gonna be a good year until it's actually necessary for you to even have a bigger car. (unless, of course, you insist on delivering all of your stuff for your house yourself) which, btw, most suvs dont' have a ton of room. they're almost on par with a typical station wagon!