I am not 100% sure on the where has the best price for the Xbox but I agree with GTi that spending the extra bucks if available is worth it. You can upgrade the code and give it a HDD and most people already have a DVD player. But if it's true that hte Core does not have wireless controllers or cannot take wireless controllers then go for the premium,
It makes life so much easier being able to move around with the controller and the wired controllers cable is to short by standard in my opinion. I am waiting for my second wireless controller so I have 1 wireless and 1 wired. My wife gets to sit comfortably on the couch while I have to move up to the screen to play the games at the moment. Not a disaster but I am looking forward to getting the 2nd wireless.
It's a fantastic system though, I was worried the wireless controllers would be fickle but I have had no problems at all with them.... They work fantastically.
If you are JHB go pick one up from BT Games in Northgate, Fourways or I think Menlyn. Check
www.btgames.co.za
Rather get one from a gaming shop because you know you are going to get the right service if you need it...