Michael,
Go to Radio Shack and check out two new switch boxes they just introduced. One has 4 inputs and 2 outputs ($59.95) while the other has 6 ins and 2 outs ($149.95). Both will convert composite to S-Video (without improving quality, but they're amplified so you don't get degradation...
--------------------------------------------------------------------------------
Did my speakers finally break-in just as I made these changes which would have naysayers argue that speakers don't break in or did the upgrade in speaker cable make the difference which would have cable...
[font=Times New Roman][SIZE=10]Mark, Noting that you said you've got all the wiring (re)done in your head, here's a simple suggestion that I've found always makes life easier for you and yours -- draw it out first, note the changes you'll invariably make, and be sure to draw a final schematic...
You may want to check out RadioShack. They recently introduced two A/V switchers (I think one was $59.95 and the larger model was $149.95) that allow you to input both composite and S-Video signals and route them via S-Video to several sources. The smaller unit may be just what you need. Good...