They are different. You get wireless controller with the delux 360 package, and a cabled controller with the 'core' package. I have heard complaints of battery life re. the wireless controls, and have the wired ones myself.
If you dont want to go 'official' for your second controler, the best make i have found for after market controllers is 'Mad Catz', they are robust and cheaper than official ones.
You have a long wait for Halo 3 (Autumn 07), but I am sure it will be worth it
If you are going to be off your feet for a bit, and able to put in some console time, get 'Oblivion'- its insane