VTRMan, if you are looking for a relatively straight forward system you could start with:

Live-Styler (or Plus) and their DVD of sounds.

OMB with a VST of sounds, e.g., SGM 201 soundfonts, etc.

vArranger with a sound module (hardware) or a VST of sounds.

You also will need a controller keyboard of sorts. Something where you can also program your fills, breaks, start, stop and so on.

If you are going total software you need a good/fast PC with suitable hard drives (7200 rpm, 5mb cache etc.)

My system is a little more complex but it sounds good and is reliable.

Frank L. Rosenthal