I didn't mean to "laugh" at the speed. In fact, we only have 100 Mb/s ourselves though it's not fiber. In your case, it's being provided by your co-op so they're being prudent, plus you're probably seeing a 10x increase in speed.
As for your current router, in your case it doesn't matter as you'll no longer have it. I suspect for your scenario, "mesh" systems are overkill so don't worry there. Second, avoid budget or low-priced routers. That said, you don't need a $250+ router, one in the $100-150 range will be just fine. You could buy a $75-100 one but you mentioned wanting it to cover growth in the future. If you like the convenience of seeing the items or returning (not counting Amazon), you can choose from a few from Netgear or TP-Link for $100-140. Best Buy should have similar choices.