Cloud, the single becket works well in the 1000gph range with a good pressure rated pump. I have an MR2 now and it is running on my main pump (barracuda) and gets most of the volume. the rest of the water is ues for my tank return, the chiller circuit, pellet reactor, UV and CA reactor. I have plenty of leftover pressure and water as well. that Cuda is rated at 4600gph.... remember, you can always throttle it back, but cant always boost it. Im sure you could get away with a used dart (3600gph). Bill and I both have an extra we are selling but depending on your timetable, i may be willing to let you borrow mine.
also, isnt the only difference between the two just the height of the neck? I will be adding a second beckett to mine as well hopefully. maybe when you upgrade, ill get yours and part it out...HA