Ok first of all you have to decide if you are going for soft or hard tubing.
Question, what EK cpu block did you get ? is it the Velocity? If so then the inlet/outlet are quite close together and large fittings like 16mm will not be able to sit flush and you will need 45 or 90 degree angled fittings for them if you are going to use thick tubing. In such a small case I would avoid large fittings altogether because some of the rads inlet outlets look very close to the distro plate and at other points as well. I would say a fair few 45 and 90 degree angled fittings will make your life a lot easier. The chrome extender fittings look very nice but it would be easier for you if they were 45 or 90 fittings.
Like others have said the EK FE water blocks inlet/outlets are at the end of the card. Look in the builds sections to see some good pics of how they look in a system. Your routing will be a bit odd with the lower rad, Shame it cannot be turned so inlet outlets are at the other end but I can see the pump would obstruct and make life difficult.
Ok your question was what fittings to get to make it look "mint". All of the fittings I have seen or felt all look great and it is purely down to personal preference what you go for. Make the decision on soft/hard tubing and go for what you like.
Suggested route with the EK FE GPU block in mind Distroblock → gpu → lower rad inlet close to window → lower rad outlet close to mobo → cpu block → upper rad inlet close to window → upper rad outlet close to mobo → side 240 rad , if you are using soft tubing you can go in and out of either point and personal choice what you like best → distro plate
That route will only work with a vertical mounted gpu and you will have a tube partly behind the gpu going upto the cpu.
I am starting my first WC build tomorrow in the Dynamic so all of the above are only suggestions using my very limited experience. What I have found out is that you just have to get the parts and then try to make it work the best you can. No doubt you will realize something will just not work and you will have to order a new fitting to get you around an issue that will arise.