Yeah, its pretty safe to say that you made a good decision, especially if you have a high-def TV.
If you do, and you make sure everything is hooked up right, you will be amazed when you see Gears of War in action. Best looking video game ever.
There are a couple of things to know when hooking a 360 to an HD set.
1. Make sure the switch on the video cable is set to HD.
2. Make sure you adjust the video settings in the menu to 720p or 1080i.
edit: I went to Best Buy last night. There had to be 40 people camped outside. If I'm not mistaken, the store will be getting less than 20 units. Should be some unhappy campers (pun intended) in about 48 minutes.... hahahahahahahaha!!!!