Jason, I just used a restaurant supply chafing/steam table pan, drilled a hole and installed the drain, and used the below device powered by simple D batteries. This device also connects directly to Coleman's 5-gallon collapsible jug, which means you can fill the jug with water and place it outside of your galley, freeing up room.
CHEAP!!!
The water supply is like 25 bucks, and the sink was 20:
http://www.coleman.com/coleman/colemanc ... oryid=6100
Here's a photo of my configuration below, prior to connecting the jug and painting my hatch props a cool gold and properly installing them!
You gotta realize that your sink water supply needs will really be minimal, which is the reason so many TD'ers don't even bother with a "working" sink.
A lot of us do it for the "kewl" [cool] factor, but in practice and in actual camping, you could more than live without it.