We also have the coastline 6 - but not as impressed as we have to use that extra sleeping pod. However, they do a coastline 4. It is the same as the 6 layout without the extra pod and slightly more manageable in size. The good thing is that the coastline porch extension fit as they do on the coastline 6, and just zip onto the main tent for a bit more outdoor living space (and you can get a tent carpet for a bit more warmth and comfort).
If you want a 4 berth 2 bed Coleman then the Lakeside 4 is similar to the Coastline 4 if you prefer a 'cabin' style, or can go for the top range with the Coleman mckenzie cabin, or the Coleman fremont 4 that comes complete with an enclosed porch and side entrance.

The ability to separate the front porch could give you the option of starting small and add on for subsequent trips.
I'm thinking of upgrading to the fremont 6 as it has a better layout and that add-on living area is great for when it's a bit wet.
