Off-site server mirroring

A client has a Windows 2003 AD server running MS SQL Server 2000 and an accounting app. Management wants to have a duplicate server off-site that is continuously mirrored. Typically, 8 concurrent users, maybe 20 users total doing order entry, etc. Not a huge volume of changed data, but small continuous updates.

Does anyone have any recommendations for software that would work for this over a T1? I’ve seen some references to DoubleTake or Legato Replistor…does anyone have direct experience with making something like this work? Pros and cons? Realistically, how much bandwidth does it take? Does the off-site server have to be hardware identical?

Any help appreciated.