well ive thru alot, and i mean ALOT of watercooling stuff lol, ive been watercooling for about 3-4 years now and have most of the parts.
BTW you could mod that D-tek sink to fit your GTS, i did it before and sold it already. My new EK GTS waterblock is really nice, before that i had the DD GTS block.
Well that loop wont work that well, the reason people put the res right before the pump is not to so called "starve" your pump.
Ironic using starve i know lol
but putting the res right before the pump ensure the pump is getting the most intake of liquid that it needs, if you dont it is possible to get a tubing collapse, where the tubing before the pump tends to collapse because the pump is sucking more liquid in, than is exited.
your best loop formation would be:
Pump-->big rad-->CPU-->small rad-->GPU-->res-->pump
eventually your loop will reach an equalibrium temp. and the coolest liquid will be right after the rads, so you could also try :
Pump-->big rad-->small rad-->CPU-->GPU-->res-->pump
And see which one gives you better temps.