Xbox 360 Pro Questions?

I am thinking about getting a Xbox 360 Pro (Not Elite or Arcade), and was wondering:
Does it come with a headset?
Can you use a USB Card Reader With It?
Can you play music off a Sony Walkman with it, and can you play music of it during games without copying it to the hard drive?
I play Team Deathmatch online on the PS3 with Call Of Duty 4, Resistance 2, Quantum Of Solace and also games like Guitar Hero III & World Tour. I also play Mariokart Wii online on the Wii. All without any problems at all. Will playing games like Halo & Rainbow 6 online have any problems if the others don’t? Or any games for that matter.
And can you download roughly the same things you can on Xbox Live than the Playstation Store & Wii Shop Channel? Like Movies, Trailers, Demos, Games & Channels like Internet Channel on Wii? Thanks
Can you call (Computers, Xbox’s) or IM (Computers, Xbox’s,
PSP’s, Mobile Phones,) anyone with Windows Live Messenger ? And can you video call Computers or Xbox’s?

Yes it comes with a headset, I guess you can use a card reader… I’m not sure on that one. If you can play other consoles online with no problems, Xnox live should work great. And yes, you can download movies, trailers, demos and games but theres no internet browser unfortunately.

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