Ok, those radiators look fine, and the shroud is great idea. Fans are up to you, if you want black fans look at the Scythe Gentle Typhoon (I've also heard good things about the Yate Loon). If you're looking for LED, I like my Aerocool Sharks. Your 750 should be more than enough to run that pump. That 240 has nice placement and would be good because it'd have fairly fresh air and you'd be able to internalize everything (it just looks nicer that way). The key with fans, Always bring the coldest air into a rad. If you can, pull is more efficient than push.
General airflow... is up to how you like to do it. I like to put my intakes as the front and the rear and my exhaust be the top. so everything is brought in a pushed out the top. I also create a bit of positive pressure in my case (which keeps dust out better).
I'd say get at least 10 foot of tubing, but a bit more wouldn't hurt. Dyes are a lot better (mayhem is about the best). A lot of the talk comes from when they were of lesser quality, but a lot of people don't want to take the risk, so it's up to you. I'd stick to the main brands. PrimoChill is what I use, but I know Koolance and Feser all make quality stuff... in the end it's just tubing, it's only transport. I'd also look at primoChill's antikink coil as well for tight turns... also 45 and 90 degree fittings will help in this (this is why it is so important to get in your head where everything is going for the beginning).
Reservoirs serve no purpose other than hold the water and so you can see your coolant levels easy. That is all. Do you have extra bays? and if so do you want to see you your res from the front of you computer like this?
If so get a single bay reservoir.
If you want it to look like this
get a double bay reservoir
Note: If you get a bay reservoir, be aware they make split bay reservoirs. This is for 2 independent loops... unless you are running 2 independent loops, you will only use half of it lol, so don't get it if you run a single one.
If you don't like the look of a bay you can get an internal like this, and find a way to mount it
or you can just get a box one like this
There is no best reservoir, it all depends on how you want it to look and what spaces are available.