the black ice xtreme 3 radiators are nice but they're a bit long, and you have to modify a blow hole on top to get it mounted. That radiator is too big for my taste but if you're just cooling your gpu,cpu, and maybe your chipset then a dual shoudl be good enough for you. Tygon are good as well but cost $$$ for the price. Go to your local hardware store and buy some 1/8 thick 1/2ID x 3/4OD tubing, they are less flexible than tygon but soak them in a warm bucket of hot water and they should be just as flexiable(they cost 60 cents a foot). The aqua extreme is an excellent pump and you can't go wrong with either the Danger Den d4 12v (same as swiftech mcp650) But overall the z50 is a slightly better pump for high flow blocks.
you shouldn't have a problem with that setup but with 400 dollars I would go with all aquacool stuff (it will cost you an arm and a leg)
-aqua extreme z50 pump and or danger den d4 12v
-black ice extreme dual radiator
-swiftech 6002-64 if you got the money get the dtek white water block alumnium top (both of these blocks preform very similiar but dtek is slightly better at higher flow rates by 1-2°C)
-Any hardware tubing will do.
-Reservoir is up to you, they can range anywhere from 25-100 dollars.
-Silverprop fusion HL are nice but a bit pricey you can get a more better bang for the buck gpu block from swiftech once again. (personally i'll go with the Danger Den Maze 4 GPU BlLock/Swiftech MCW50)
My setup is:
Innovatek Dual Radiator
Innovatek Dual Radiator Fan Guard
Innovatek Reservoir v1.1
(all converted to 1/2 ID from 1/4 system)
Danger Den D4 12v pump
Dtek White Water (alumnium top)