Welcome to the 360 family!
You can't go wrong with the games you mentioned and Gears is a must buy.
Friendly word of advice though; if you get Gears and decide to try online multiplayer, hook-up with some friends from here or elsewhere the first couple of times. There's a pretty steep learning curve and everyone having a mic, is well a blessing, and a curse. Make a noob mistake and lose the match for your team...and well, there are some people who aren't very forgiving, I guess.
You're welcomed to add me (TRios Zen) but I think you are in Europe and you know...time differences and all...








