Well I have gone through my share of xbox 360s as well but as long as xbox keeps replacing them i dont care. I got my First one of Feb after launch and i knew they would have been rushed system, so I bought a 2 year warranty from xbox for 50 bucks, and since they gave the 3 year RROD warranty my warranty is still covered till feb 2011 which isnt to bad.
I know the ps3 is also a great system but no one I knew ever had one except 1 or 2 people and i dont have a 1080p TV. I thought about buying one this year becuase the game line up is looking good and the major price drop, but if im playing online or multiplay im sticking with the 360.
But for price per price you get more in the ps3 right now.
And to answer that question on wireless If you want wireless yes you will need to buy a wireless adapter but you dont have to buy xbox version you can get the linksys game bridge or something. i prefer wired myself and if you have 2 ethernet ports on you pc or if you pc is wireless and has an ethernet port you can connect there 360 that way(with internect connection sharing on windows).
And will it eat your internet? depends on your isp(for gaming in all depends on you Upload stream and ping ). But i have 3 computers and 3 360 at my house on during weekends an never really had an internet problem while running at the same time
ps. i went to tech school and studied computer networking so i you have question on your network I might be able to help







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