I am inclined to agree with jingles that your best bet is probably a DMX Operator or 192. The 192 has USB, Audio Input, and a tap sync button over the regular DMX Operator. It also has 240 total scenes and 12 chases vs the 6 and no scenes on the regular.
Scenes will let you set a look and simply hit a button to then bring up that look. Chases will let you chase colors and/or intensities of the fixtures which can then be tap synced via the button on the 192. Midi on the 192 will let you trigger scenes, chases, or blackouts. It likewise still has handles that you are use to on the Stage Setter. Finally, you can control a fog machine with it, though only AMDJ models or DMX controllable models.
All and all, I think you should go with the 192. Will make you life much easier with the ablity to just simply bounce between scenes or bring up a chase and tap sync it. You can get even more in-depth and add Midi control. Not quite sure how involved the RCA input is, but that might be another option as well. So it should work wonderfully for you. It even has room to grow since it can control up to 192 DMX channels in case you want to add say some more LEDs in the future or a strobe, etc. It wouldn't be the best for controlling moving lights however. I would recommend something along the lines of a DMX Operator Pro, a Magic 260, or a Show Designer 1. Its not to say a DMX Operator 192 can't control moving lights, it is just an ease of use factor it all.