The Mag 18 would be your best bet to acheive your desired flow with the amount of head the pump will be fighting. Mags are good pumps, but they run a little warm and attract calcium deposits more than any other pump I've used (calcium likes to build up on warm surfaces).
If money is no object, and you are dead set on using a submersible pump, I would suggest using two mid-sized Eheim pumps that together push the desired flow. Eheim pumps have a reputation for being extremely reliable and using two of them will allow for redundancy in case one of the pumps were to fail.