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Maximum subnet sizes for DMVPN

We are turning up a DMVPN tunnel network that will have 400+ spokes on it.  Curious to know if there are any recommendations on maximum subnet size that should be used on the tunnel.  Can I get away with creating a /23 or a /22?  Since DMVPN is NBMA, I would think that it doesn't suffer from all the broadcast traffic you would get on an Ethernet network so going bigger than a /24 might be OK.  We would be running OSPF on the DMVPN tunnel to peer with the spokes.  I don't believe the old rule of no more than 50 devices in an area applies anymore so I'm less worried about OSPF.

 

Thoughts?

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