I purchased myself a V5 from jpiperformance with 2 xlr120 rads

(there is a rad on both sides of the box)
dimensions of the v5(roughly) are 17"(L)x10"(W)x10"(H)
the rads are 2" thick, so the space i will be able to use inside the v5 for mounting a pump will be 6"wide.
the iwaki is about 2.75 "wide , if i would put my pump in the middle of the case, the distance between pump and radiators will be about 1.5" from pump to each radiator.
-Will this hurt airflow through the rads
-will the heat of the pump have impact on the cooling capabilities of both rads(radiaton of heat from the pump to the rads).
I have another option, taking 2 swiftech mcp600 instaed of 1 iwaki, the swiftech doesn't produce a lot of heat(about 9W each).
What would be the better option?