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Mag drive pumps work well as do dolphin DP series as well as Sedra and Sen brand pumps. If it were me i would go with a dolphin DP-560 575 GPH pump. Dolphin has awesome customer service if you have problems! Forgot to ask internal or external mount?
Mags are good as well for your money! Both have proven very reliable so it is basically a money thing really. If it is for a skimmer I would get a mag 7 because as the pump gets dirty the flow will degrade substanially. This would be very critical for proper skimemer performance.