For an oil cooled system, contained as that's where you want to go,
I would go for dual 120.3 XSPC radiators, an RD-20/30 pump as oil is relatively viscous, and then a Swiftech GTZ cpu block as it is the least restrictive of the current kings of cooling. For the GPU block go for whatever, it doesn't really matter too much.
If you want to drop your temps even more, then the way to go is to put a huge reservoir, I'm talking 10 gallons plus into a full size freezer, and hook that up in line if you want to bench or something. The sheer amount of cold fluid should be able to keep the freezer from warming up too quickly. However it would not be practical for 24/7 use.
For tubing, go with Tygon A-60-G food grade tubing, it's what I use and is not porous so oil cannot escape. For fittings and whatnot, you will need worm drive clamps and in all likelihood bitspower fatboy barbs to keep the tubing on tight as the pump puts out a tremendous amount of pressure.
Yes It looks like I picked some of the most expensive water cooling bits out there, but high performance costs bank.