Dave, depends on what and how much you want to do with the TS-2000 (happy owner here!). There is TRX-Manager wich can control the rig from the computer, save and edit and program memoiries, along with some other features, log, terminal, (web) DX Cluster, rotor control, satellite doppler control when you use satellites on 145 and 432 and more, see: http://www.trx-manager.com/
There is MixW 2.x which is multi mode soundcard software, most of the soundcard modes like PSK, MFSK RTTY, etc and CAT control (this takes an extra serial port or a USB to serial converter if you only have one serial port on the computer. MixW site: http://www.mixw.net/
Also Logger, Hamscope and a few others offer some CAT control and soundcard modes, but use MixW here and it works well for me.