I was thinking more along the lines of:
pump->rad->cpu/pelt->rad->pump->gpu/pelt->res
If you still wanted to use 2 pumps (and still had the 2 bix's). With the single rad/single pump I would go for:
res->pump->splitter->(gpu/pelt-cpu/pelt)->splitter->rad
Are you looking for redundancy? I am looking to use 2 pumps myself, just I'm not sure how flow would be affected if one were to die. I'm interested to see what setup you finally decide to use, good luck.
*Just my humble opinion