If you're set on a PC, then look at a high-end Pentium II or III. If a Mac is more your forte, then look at a G3 server (one with a disk drive for copy protection disks).
For the software, you have many choices, ranging from PowerTracks Pro Audio and Cakewalk Home Studio all the way up to Cubase VST/24, Logic Audio Platinum 4.0 and Cakewalk Pro Audio 8.0. Have a look at a local music store and decide based upon the interface and future expadability.
Steve Martin
Ward Music