Yeah I'm with @Nash . MX84 is an upgrade from an MX80, it'll have about double the performance. MX100 will be even better if your budget permits that. MX250 will likely be overkill, gigabit links should be enough for you. Once you're upgrading your ISP's uplinks you should start thinking about MX250. More info in the sizing guide: https://meraki.cisco.com/lib/pdf/meraki_whitepaper_mx_sizing_guide.pdf Now regarding the single point of failure of the switch, rather than reinventing the wheel I'd like to link you to a community post that talked about this specific topic very broadly: https://community.meraki.com/t5/Security-SD-WAN/Splitting-dual-WAN-links/td-p/57859
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