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I would go with (3) 1" bulkheads.
The box should be sized deep enough to hold down turned street elbows and wide enough to remove them if needed.
With (3) bulkheads you can achieve a dead silent setup with NO AIR being introduced to the sump.
The first standpipe will run at full siphon and be regulated by a ball valve set to NOT quiet handle the full flow of the return pump.
The second standpipe will have a fully open valve and an air inlet in the top (like a durso). This standpipe will handle that little bit of flow tha that the first standpipe is set to reject.
The third standpipe will have an upturned (or partially upturned) elbow with strainer. This will act as an emergency standpipe if the water level rises too high. It will also may kick in on startup before the main standpipe starts to siphon.
The setup is very failsafe, never needs adjustment and is dead silent. It is very self tuning.
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