Practically any latest base unit would be suitable for the tasks you describe with the proviso you don't wish to multitrack more than stereo cd quality at one time, and that you may wish a better quality sound card than supplied since still recording the 6000 through analogue in, but in terms of power would be enough.

If you want the latest graphics capability for photoshop editing from multi megapixel cameras, or my own current interest of video authoring, editing and recording of DV and DVD creation and copying then a more powerful machine is definitely required - also if you want to progress to the real time sample players from hard drive, staying in the music area.

Whatever you buy it's out of date in 6 months