Water Cooling Question

Here is a diagram I have made of what I want to do with my HAF 932 case to get it water cooled, but I need help. W Here should I put the pump? I think I have everything else mapped out well but the pump is giving me a hard time. I thought about putting it on the bottom but that would create a lot of back pressure from the pump to the radiator and I don't want that. At least I think it will, but it could work this is my first WC build.