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You're going to get quite a bit of feedback on this one I'm thinking. So far you're missing barbs. I have been getting the thicker walled tubing (1/2id, 3/4od) since I believe it is less prone to kinking.
I've not used Koolance products but this thread leads me to believe it may not be the best option http://www.tomshardware.com/forum/280091-29-koolance-98...
Also, make sure your graphics card is on a reference PCB before getting the water block for it.
I like thick walled tubing so 3/8 ID and 5/8 OD with fittings to match I do not like the res pump combo but many have used them without issue. I like the pump and res to be separate from each other. I like the D5 or 655 series pumps and as far as the rest it is up to you and what you like or want it to look like.