Xbox 360 Help Needed

Hi there

My xbox 360 has the 3 red rings for the second time now so I am contemplating what to do. I can't be bothered to wait for microsoft to come and pick it up and take 3 weeks +. So, what I wanted to now is If I keep my current hard drive, and I buy a new arcade console (with no HD) and I put in my old hard drive will it still keep all my saved games, online profiles, gamerscore etc. If it doesn't is there a way that you can without involving microsoft in it?

Regards and any help appreciated

Cheers, also are you sure my gamertag will stay stored on there because I have heard rumours that it doesn't? Another thing too, will there be a space on the arcade console to fit a hard drive?

Regards