ah, now we're talkin!
phew...
advice's:
1| don't mod any of those asetek solutions.
i know you didn't do much digging with the sticky - but i'll be quick.
the asetek/corsair H series/antec Kuhler's use a copper base plate thas in contact with the cpu/heat producing end and the enitre loop runs on an aluminium rad.
the reason these LCS' work is cos they have corrosion inhibitors +they haven't been pulled apart after 2 years of use to see if there is any corrosion happening.
If you do mod it, you'll loose out on their secret ingredient'd corrosion inhibiting cooling liquid and run the risk of gunking up your loop after 6 months of use - depending on how much copper+alu you have in the loop+the liquid as well.
2| anything you'll do after modding is down hill after that. since the rads won't dissipate much heat. You have a cpu tha runs hot and then you have GPU's that'll be hotter.
end point:
you'll have a nice loop to look at but functionally its not working nor is it good on your wallet as the corrosion can spring a leak, drop temps and give bad perf's on your rig and eventually leave you dead in the water.
3| start with a fresh loop with one metal in it+ hold onto that phobya pump - but find some reviews about that pump. last i checked it ain't good :/
4| but for now, get a GPU for that money and crossfire it later on...could wait for nvidia to launch their lineup to see if AMD new cards drop in prices(who knows older cards could drop too)
5| need something now..actually wait a lil or go for the AMD 6xxx series cards.
hope that helped.
P.S: the pumps on them LC's are ewak for starters. modded a H50 - which is the same as any asetek 550LC and the temps start o plummet after you add more than 240mm of rad and it has trouble negotiating other blocks. (if you're planning on using the 55LC's CPU contact plate/pump chamber)
FYI - the pump is located above the cpu inside that chamber for both your asetek's mate.
* now i did exactly what rubix doesn't - and what i avoided in the initial posts...too much info :/