Right now, I have Thermalright mosfet heat sinks on them. Can't really tell if they heat up of not. Maybe I wouldn't need to water cool the mosfets?
Touch them?

I have no planned budget. I figure I'll get a list together of stuff that will do the job well and then figure out if it's over-kill and scale down the parts from there?
Yeah, start from there, if comp fittings add too much to the final price, go for standard fittings.

What's the advantage of using compression fittings? From your knowledge, is the D-Tek better than the EK-Supreme?
They look better and are safer. I dont know about performance comparison between those 2, you should probably ask Skinnee, he is the one that will give you a better answer. When I bought my D-tek V2, Im pretty sure EK Supreme was not out yet (I believe) and I was recommended the V2 everywhere, water cooling gallery had tons of those so I decided that was my choice, I also like more how it looks.