Very cool! I'm stoked you were able to get my schematic working for you.
I took a look at your site. I might now have an idea what you are building - red, yellow, green and white make for the typical colors of a city lighting plan. White for street lights and windows, and r/y/g for traffic signals. No?
I'm looking at the DM74ALS1005N and a couple other hex buffer/inverters. With an open collector output, the output logic state can be inverted or not by me, depending on how I connect it to the opto-isolator. If I invert it, the circuit gains some efficiency. I'm also looking at the SN74LS07 (http://focus.ti.com/lit/ds/symlink/sn74ls07.pdf), which is the cleanest option because it's non-inverted and I would invert it in the schematic, but it costs 90 cents a pop. Then there's the MC74AC05 (http://www.onsemi.com/pub_link/Collateral/MC74AC05-D.PDF), which is 1/3 the cost, but I can't invert it and will have to eat the efficiency loss. Decisions, decisions. 