I'm going to shy away from actually recommending something because I've read too many opinions and experiences that differ from my own.
For instance, I don't get on with sealskins at all. I find my feet get sweaty and clammy cold. For me, I need a wicking sock (like merino) to get sweat away from my feet, because sweat chills. Layering socks also doesn't work for me, and can get uncomfortable. I have a 'less is more' approach - but this necessitates getting the balance right and the right sock/shoe combo. And "right" depends on weather conditions.
For dry temperatures around 5c, I find DeFeet 'Woolie Boolies' with normal road shoes work fine. More than that, the Woolie Boolies are too warm and I swap those for a thinner sock (like the DeFeet Aireator) . If it's raining or damp, or lower than 5c, then overshoes go on top of that. For around zero or below temps, then I change the shoes for winter boots (still with Woolie Boolies). I've yet to find a need to go more than that!
Yes, I get it wrong sometimes (usually on longer rides when weather conditions change) but the above outlines my general approach... and I'm still learning! I can only suggest you experiment and see what works for you.