Ok, ya dont get the arcade. Get the reg. white 360, unless you are willing to get the elite, go with the regular, 360. I have it and its fine. heres a link to xbox.com with info on em.
http://www.xbox.com/en-US/hardware/compare101.htm?WT.svl=nav (FRONT PAGE FOR CONSOLES)
Heres the on i have, its good.
http://www.xbox.com/en-US/hardware/x/xbox360prosystem/
And heres the elite...http://www.xbox.com/en-US/hardware/x/xbox360prosystem/
And the arcade one, but i dont recomend it cuz you cant get live..http://www.xbox.com/en-US/hardware/x/xbox360arcadesystem/
Now the elite costs 449.99$ and the difference is that it has a huge 120gb hard drive, and its black, it comes with a xbox silver live, (non online play), a black controller, and heaset And amonth subscription to xbox gold live, which allows online play. Its a great deal, but i have the regular one, and a huge selection of games, and i still have 10gb left of my 20gb 360.
The reg. 360 comes with 20gb memory, sould come with white headset, and a white wireless controller. This one costs 349.99$ and is a good deal, and not as expensive as the elite.
The arcade however is 279.99$ and is not that great to me. It comes with a memory unit and im not sure with the hard drive, and IT DOES NOT allow live. \
So im my opinion, go with the white, 20gb reg. 360, and if your willing to spend extra, get the elite. Also look around because certain stores may have bundles that come with games, and bonus materials,. Good Luck