I don't recall if i posted this in the other thread, but i had a similar 300 EU/t design.
No diamond stuff, so UU shows cheaper. 656 Cooling and 6 duel uranium cells:
The reason i was in the planner though was to work on these thorium things. I thought why not try to combine all you need in 1 reactor.
Thorium neutral and breeds 40 cells at 0 degrees, which centrifuges back into the exact amount of fuel needed to run the cycle. So i guess it a gregtech hybrid (plut+thorium) hybrid (power+breeder) design.
Higher running cost on the first thanks to the quad cell. Running costs are a bigger consideration than build cost.
As for the breeder, neat idea!