How to limit bandwidth per SSID or do I need another VLAN?

[jwhiteker]

Trying to set up some sort of prefferred network for staff vs. guest wifi.  I have an MSR20-10 enterprise router and 3 of these M220 AP's clustered.  I'm running two SSID's on a single VLAN.  I need one of the SSID's to have prefferred throughput vs guest wifi connections.  Should I do this at the router with setting up an additional VLAN?  I was hoping I could just set a bandwidth limit on the guest SSID at the AP like some other brands allow.  What is my best option here?