THe internet has always been a bit dodgey in my house so im not sure that if i buy a wireless adapter it will work becasue with my last xbox i had a cable and it was fine but now in upstairs and the router its downstairs so should i buy a long cable or a wireless adapter with the chance it wont work ?

I don't know how big your house is but I think the wireless should work for you. that's what I have. router downstairs in bedroom and Wii upstairs in bedroom.

wireless adapter thats what i have

i've have an ethernet cable for the last 18 months and never had a problem. i would rather pay about £15 for a 5 meter cable than £50 for an adapter to find out the connection isn't reliable. hope this helps!!

They have two wireless adapters out now for the 360. One is like a G router so it goes ok and then the new one with two antennas is the N router which should get you good reception. The G router I think went from $99 to $69 and the N router is $99 now. The best connection would of course be the ethernet but do you really want wires all over your house.