Hey dude I just bought myself a 360 to compliment my wii.
Get the premium package - its £80 more expensive - but well worth the extras that are included.
The best deal right now is with Woolworths. You are getting a premium console + extra wireless controller. Gears of War, Crackdown, and PGR 3 for £299 (Thats what I got) Seperately this would all cost £430ish.
The diff between the core and premium is as follows.
Core has - wired controller and scart cable.
Premium has - wireless controller, scart & composite cables (for hd), 20gb hard drive, xbox live gold (1 month trial) - xbox live headset.
Elite is aimed at the PS3 market - overly expensive big black console - for people who absolutely have to have the "best" graphics mode available - HDMI
(The hard drive alone is £60 and the composite cables are £20)