Additionally, and in the event you decided to build a custom loop, I don't think it'd be necessary to add dye to the coolant if you're using red tubing.
Lately, I've been experimenting A LOT with liquid cooling, and my vote is for water. Also, remember that every additive you put into your system displaces your coolant.
If you're worried about the fluid's electric conductivity, you can pick up de-ionized water - MUCH cheaper than brand-specific coolants from sellers like Cooler Master and EK - at just about any hardware store.
Here's a link to a very straightforward article you - and everyone else - might find interesting -
http://www.lytron.com/Tools-and-Technical-Reference/Application-Notes/The-Best-Heat-Transfer-Fluids-...