re: Water Cooling: My First Loop

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This is where I'm lost. If I'm doing CPU & GPU what size components will I need? Is 1/2 tubing better than 3/8? I would imagine it's a volume vs. pressure tradeoff but which should I use? What size pump and reservoir?

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From what I understand the diameter of the tubing doesn't have as much impact as the pump you choose. There are two types of pumps that are rebranded/slightly improved by manufacturers. They are the d5 and the ddc. Refer here for an overview of the differences LINK
I don't know much about choosing reservoirs or the major differences between pumps. Sorry.

ETA and if you are buying an evga 680 you may as well just get the 4gb if you have an inkling that you want to do 1440 or surround. If you bought the 2gb initially and put it in your loop, then decided you needed more Vram you'd have to drain the loop, remount the block on another card, refill the loop etc. Seems like a PITA to me especially since your build doesn't seem like a budget build. If you're spending 400 on a gpu plus another 300 to WC, 400 in HDs, etc what's another 100 bucks for more Vram.