Whats the one to get?

I heard of a premium one or a core one is it?

I aint got a clue about them. I dont want to buy one then have to get other "add on" things for it to play other games etc or whatever the difference is between them. I'd rather have it all when i buy it from the start..if you can

Any help would be cool. In short i want one thats got it all and all ready to go just not sure what one it is or what they call it

cheeRS

Rob