If you want to take the opportunity to upgrade to a 10Gbe core, then I would go with:
MS425-16 to replace the 3850 12S
https://meraki.cisco.com/products/switches/ms425-16
If the others are just used for access and don't need redundant power, then the MS225.
https://meraki.cisco.com/products/switches/ms225-48
If you want to stick with just Gigabit everywhere, then:
MS410-16 to replace the 3850 12S
https://meraki.cisco.com/products/switches/ms410-16
If the others are just used for access and don't need redundant power, then the MS210.
https://meraki.cisco.com/products/switches/ms210-48