[robespierre]

Why are you looking for a managed switch? I don't see any possible reason for that. A switch is just a bridge, it moves ethernet packets around and is mostly pretty stupid.
A router is a far more capable device and many routers have built in "switches" on a subset of their ports if you actually need that as opposed to just using a dumb switch or hub for LAN segments.
Unless you have a very large or complicated network, just assume each LAN segment is a local security domain and has total, unfettered access within each.
Your router is what provides a firewall between those segments, for example between a local "secure" segment that you control, and the public internet segment to your ISP. It does that using routing rules, and also with proxies if supported. I think VLANs are mostly a waste of time unless your network is so spread out that you can't physically connect different security domains to different router ports (because that is the only thing they accomplish; they do not provide any packet filtering at all).