You should make you a little LED graph display that shows the water level. Like you see on the stero equilizers. Goes from red at the bottom then yellow then green.

That would be cool. You could fit it all in a 5.25 bay. Have the graph on it, a couple LED displays for the water and room temp and CPU temp. You could even fit in a few light up switches for fan controllers.... Hummmm.... Nah, I already have to many unfinished projects...