My group has been playing Catan every weekend for a year. We love it but it's getting stale. I've heard of Terraforming Mars and Pandemic Legacy: Season 1 as "next steps."
We're 4 players usually, sessions around 90 minutes max. We like trading and building but are open to new mechanics. Budget is around $50.
What would you recommend? I've looked at BGG but the top 100 is intimidating.