Hey i had a great 29 gallon setup. Maxi-jets are not great as return pumps in my experience. I had used a Quiet One 1200 which was about 296 gph. This pump worked awesome and did a lot better at dealing with head than the maxi-jet.
I have similar water volumes for my nano, 20 gallon display with a 15 gallon sump. I'm using an eheim 1260 for my return which generates pretty good flow for the watts it uses. Make sure you take into account the heat generated by the pump!