What should i call my gamer tag?

i have a ps3 but im buying a xbox soon in like 2 days because im geting tired of the ps3 and im not sure what i sould call my gamer tag because for my ps3 had a dumb name and i couldint change it so i want a good one for this. any ideas ?|||-XxInVinCiBlEeXx|||you should call your gamertag, gamertag|||You should call it a "gamer tag".