Recommend that I get rid of some games.

I would get rid of Last Night on Earth. For me it's one of those low-tier Ameritrash games that have nothing to go for them beyond their setting. That is, you don't play LNoE because it has interesting mechanics, or actual decisions or a fun narrative but simply because it's a zombie game and hey, you can fill the car's tank with gasoline and run away. I think you can play far better games than this one. Like, well, Wiz-War or Cosmic.

51st State: This game is a complete victim of wishy-washy bland design and not great one, that that. It's edgy enough to have a Nazi-themed faction but not edgy enough to let you harm the position of another player. In fact, it gives them resources and points!. It's overbalanced in the sense that everything is a good strategy but it also snowballs out of control. When I first played this game I arrived a bit late and had to kill some time browsing the internet on my phone. After playing it, I wished I had stuck with my phone.

Interesting to see people dislike Mare Nostrum, I thought you guys loved it. Specially Barnes, didn't you love that game for a while and even compared to Francis Tresham's Civ?

Last Night on Earth is AmeriTrash, but weak. The scenarios are uneven, and don't seem well playtested.

Small World is weak DoaM for Eurogamers. Ditch it for a better DoaM.

I wouldn't recommend letting go of Dungeon Degenerates.

Small World and Last Night On Earth are disposable.

Wait 2-3 years and then let go of Dungeon Degenerates for $300.

People hating on Spartacus.... what is real anymore?

Just to be different, let's say ...

Can't Stop

Because you can play it online or on a mobile in about a thousand different implementations.

Magical Athelte

Just because something is niche doesn't make it good.

... and I'd suggest you hold on to Mare Nostrum so long as it's still seeing table time. I think it's one of the best civ-building games around, especially when you factor in the manageable play time.