That res and pump combo would work, but you may want to have a look at Jab-Tech, Sidewinder, and Performance PCs as the price seems really high. Also, I know that you will save a lot of money on fittings, rads, fans, everything else at those 3 sites. Like, I am going with all 3 for various parts and it's saving me well over $100.
Yes, you can connect two dual-rotary 90deg adapters to for a quad-rotary 180deg fitting. You may want to use an extension fitting between them if you are going for a 180deg turn, though, as it will be less "sharp". Idk if it'll have any effect on flow, but my rusty physics tells me that it might.
Regarding tubing, I like 1/2ID x 3/4OD as it has very thick walls it looks nice and substantial, and it will never be the cause of any flow problems. Plus, every fittingi avavailable in that size, which is convenient. You can get 10ft of any color Primochill Primoflex Pro LRT you'd like for $18 @ Jab Tech (use the coupon code facebook for 5pct off entire order). The difference is mostly aesthetics, but I just really think it looks so much "beefier".
Oh, and the XSPC fittings as well as the Bitspower Rotary Angled Adapters are available at Jab Tech also, for really good prices (45deg matte black rotary Adapters $9.50/ea if you buy 2 or more, and the 90deg are $14).
With the heatsink for the MCP35X, you don't have to use the legs; you can simply screw on the heatsink, but you will need them if you want to use the fan underneath. It shouldn't wobble if, just make sure you set it up so that the pump is not being "pulled" in any direction, and you can always use a bit of padded double sided tape under each foot to help keep it in place as well as to reduce vibration. Another option is the use of a male-male coupler fitting to mount it directly under the reservoir (you can use spacers here too; btw, XSPC 10mm spacers are only $1.99 @ Jab Tech), an option that is best when you are using a cylinder res, but it could be done with a bay res, it just might be a hassle.
Here is a link to a strong 80x15mm fan: http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=36_394&products_id=2223
As for TIM, here are my recommendations in order:
Shin-Etsu X23 (I always forget exactly which one, but I believe X23)
IC Diamond (may "polish" your chip and remove lettering so be careful)
Arctic Silver Ceramique (non-conductive so it is decent choice for GPUs)
Arctic Cooling MX4
Arctic Silver 5 is no longer one of the top TIMs, others have surpassed it by a number of degrees, and the others don't have a 300hr break-in time.
1gram of TIM should be enough for a CPU and a GPU as you want to use a very small amount, slightly less than a grain of rice. And let the block's pressure during installation spread the TIM don't do it yourself, as the block will push it to the areas its needed such as if the CPU/block is bowed, something that you can't adjust for.
I am pretty sure that is it
and I am happy to help, that's what places like this are here for