Refugium or not?

[CHEAPREEF]

I'm tring to plan my sump out and wanted some opinions on weither or not to include a fuge of some sort or not. The main tank will be a 40gal cube, the stand will be 36hx24lx24w so space is limited. The area i have for the sump will be approx 14hx18lx14w. I'm going to use a 4MD-SC for a return, and another one for my skimmer. So i would think a few baffles are in order. So what do you guys think should i add a fuge or should i just use it to house my equipment? If anybody has a ny plans or drawings that i could gofrom that would be helpful too. Thanks.

Clinton