Xbox 360 for Holidays, Premium or Elite + misc. questions

[DING-DONG YO]

Sorry, couldn't find the answers to these by searching.

It looks like the only real benefit to the elite is the larger hardrive. They both have HDMI now, so they can both go 1080P, no?

What other differences are there that I am missing?

Is there any risk of buying a new pre-falcon model in large chain stores anymore or are they all the Falcons so no RROD?

How does the headset that plugs into the wireless controller work? Pretty seamless or laggy? It seems that paying $60 for the wireless headset when the stock headset plugs into the wireless controller anyway is kind of silly.

Also, I know this has been covered on here before, but Halo 3 or COD 4? Are both games in 1080i? I am a huge CS/Socom fan and played both multiplayer version extensively (back in the day that is)

Thanks, VG forum!!