Mag pumps vs Quiet One

[tbone]

omg my pump just died....

whats a good turnover rate for a refugurim?

i was planning to get this for my main tank Quiet One 6000
and this for my refugurim Quiet One 3000

i have a 90 gallon tank. with 3 return lines should this be good enough flow?
Quiet One 3000 (55.96 each)
Pentair Aquatics 780 GPH
Quiet One 6000 (111.96 each)
Pentair Aquatics 1506 GPH
Mag 1200 (136.76 each)
E.G. Danner 1200 GPH
Mag 500 (71.96 each)
E.G. Danner 500 GPH

having some problem deciding which pump to get? quite one pumps are a little cheaper.