Questions on Watercooling and Lighting

[OnixRose]

I'm looking into water cooling my rig because as of now it's quite loud albeit relatively well cooled on air. I know next to nothing about water cooling as I've never done it before, so this ITT I have a few general questions about water cooling and lighting as well.

Before I ask my questions I'll post a general overview of my specs for this build. I'm running an intel i7-980x on a gigabyte x58A-ud7 mobo with mushkin ridgeback DDR3-1600 ram (cas lat. of 6 ns), and an evga gtx 480 superclocked+ graphics card (back plate is well worth it for aesthetics imo). All stock speeds, I overclocked a little when I first got it but took everything down until I'm more comfortable with the process and temps.
For cooling I currently have two bottom 120mm intake fans, a front 140mm intake fan, a 140mm fan behind the hdd cage blowing air onto the graphics car, a 200mm fan on the side intake, a 120mm an on the top for exhaust, a 120mm fan behind an nh-d14, and the psu fan right above it. All of this is in a Thermal take armor+ VH6000

My first question is should I use a single loop? I would have my cpu, north bridge, and gpu all in the loop. Or should I use a dual loop in case I get another graphics card? In either case I'm not sure of the size of radiator I would need (thinking a triple for single loop and a triple and double for a dual loop). I know of all the basic parts but i have no idea of the specifics for each. No idea what kind of pump/s I would need, I have a few ideas on reservoirs, but no idea what to actually look for in them.

Secondly as of now my case mixes LED lighting and UV lighting, but I want to be able to make use of one or the other. What I mean is that, after I switch to water cooling, I plan to use UV tubes with some cords and reactive pigment, as well as UV reactive fans. I plan to use something similar to gelid wing case fans, as they're the only one's I've really been introduced to, but any recommendations would be great. However I would like to keep fans to a minimum, after all one of my main reasons for switching to water cooling is loudness.
But, I would also like to be able to light up my case using LEDs.
So would the best approach be to use a lot of cathodes and just turn them on when I want that kind of light and then turn them off to switch to a more UV dominate scheme. Are their fans with UV reactive blades that have LED controls of some sort or would I have to solder some stuff for it to work?

Some temp info:
idle gpu 44C @44% fan speed
While running unigen heaven v2.1 max settings
average 54C max 70C fan @59%

idle cpu high of 35C (need to change thermal compound)

I can give any other sort of info that would help out, and link more parts if necessary. I'll post pics if anyone wants as well.