If looks are of interest... then remember that WW is pink. The green dye will make the water look like a grayish pink, or grayish green. Consider red UV dye instead...
I don't think that the 1250 is overkill: you'll get a better flow rate, which will cause a higher flow speed in the block, and that's good. The improvement in CPU temps from a 1048 is probably negligeable though, but for $10.00 difference, I don't think that it's wasted.
As for fans, I'd stick with the ones that would give you the highest CFM (i.e. ignore noise, consider price) then apply a rheobus mod to quiet them down to what you can personally deal with. You can then play with it, observe the results, and adjust it any way you prefer.
That's what I'd do.
