Terminal Server or Citrix?

I’m considering a remote desktop solution for between 20 and 80 remote users (number will depend on costs and the benefits of the chosen solution). Windows Terminal Server and Citrix come to mind as the two available solutions but there may be others I’m not aware of. Basic specs of what I’ve got to do are below:

– All users have about 384k + – to play with.
– I want to run Outlook, Internet Explorer and some LAN-type applications for our consumer loans system.
– Client machines may be a mix of 98, 2000 or XP so the remote client software needs to support that.

Thanks in advance.