Did you ask her the customary 21 questions? <object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/cPycbYWRqEM"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/cPycbYWRqEM" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object> Seriously though, congrats...
This isn't really about her. It's about both. Ya see, once you get married, both you and she will place your primary financial focus on securing your future. Sure, you'll buy yourself some toys every now and then, but it won't be nearly as much as when you were single.
But there's always a way... "Oops, I guess I didn't put that entertainment center together as well as I thought. Have to get a new tv, dvd, & home theater system. We should definitely get a flat panel because they weigh less and would prevent this from happening again. Since we're getting that, we have to upgrade the other components because the cheaper stuff just won't work. Honey, can't you imagine HGTV in HDtv?"
No. It's not about her or him compromising. After you get married, you're gonna start thinking things like.."Okay. We're married now. We're gonna need to eventually buy a house (in a few years) - that means that we have to save at least $25,000 cash. And her car is gonna die in about 3 years. We're probably gonna need to think about having kids in about 4 or five years. Somehow we've got to financially achieve those things and get away from the "paying rent to live in an apartment" phase of our lives. You'll be thinking things like that (and more.. much more). And once you adopt that frame of mind, you will no longer be choosing to blow your paycheck on a $2500 television like you can when you're single. Sure, you can (and will) still buy a TV or dvd player, etc. But your ability to just go out and buy one casually will be greatly diminished. Instead, you'll have to budget, save, and figure out how you will be able to afford the TV (or whatever it is) after you've met those financial responsibilities and goals.
I'm working on it. Took her to a couple of games last year and although she won't admit it, she LOVED it.
Always be honest. Don't hold a grudge. Fight when you have to, but make up just as quickly as you fought. Be accepting. Be affectionate. Pay attention. Take her seriously. Laugh...a LOT. Above all, be yourself and allow her to do the same. Congrats and good luck.
Words of sage on keeping a good marriage "Keep your dick in your pants at all time" This is easier said than done.