I really need to change my gamer tag but i cant think of any thing good to change it to any suggestions?

ok so after playing halo3 for a couple of months ive gotten bored with it so i need a new game that has a very fun online experiance, shooters only, please leave suggestions

p.s. for 360 only

I just got Guitar Hero 3 and I was wondering if the controller would work for guitar hero 1 and/or 2, please tell me if you know.

I was wondering if I should get guitar hero3 or rock band for the 360? I also wondered That this would be my first guitar hero game , but I heard it was really hard, Is it a good Idea to start with it?