i have the 46 gallon bow tank, i bought a 20 long tank, glued some baffles in it with silicone, (got the baffles of 1/4" glass at ace for about 5 bucks) have a dump chamber, a bubble trap, a inline fuge, skimmer chamber, than the
return pump chamber, what ever tank you can fit under yours would work great, i dont like rubber maid containers, because they are hard to fit baffles in, but alot of people use them. so... its up to you. the hob over flows are very safe imo. i would recommend a u-tube design, of if your really worried about it, they sell some with little pumps that keep the prime, as long as you have one return line that will suck air in a power loss, you really have nothing to worry about.
andy.