As @Brash mentioned, your setup is perfectly fine. Replacing the actual firewall with an MX will easy your management and monitoring as all will be done from a single dashboard. Other than Brash suggests, I would go with the MX75 if the budget allows it. This device is the newest one in the line and is likely supported longer than the MX67. If you are on budget, the MX67 will be perfectly fine, I operate plenty of them even with more users. But I would not buy the MX64 any longer as this device is already quite old.
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