I've been on 8.1.9 on 3020s, vm-300s, 820s, 850s, 220s with no issues. I believe that is the recommended support version.
Probably want to install the latest 8.0 version, reboot, download 8.1, download 8.1.9, install 8.1.9, reboot.
The upgrade path that @craigomatic already mentioned would be what I would follow. Keep an eye out for when 8.1.9-h4 actually hits recommended status so you're covered for the three vulnerabilities they announced Wednesday, by the time you upgrade 8.1.9-h4 might have actually had enough time to mature to reach a recommended status.
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