I forgot about the HP series of Hubba tents. I have a buddy who owns one and swears by it as an all-season tent where he hikes (mostly western Virginia and the Smokies.) He says It's a nice compromise between the solid wall's wind-blocking abiliity and the mesh's summer ventilation. (The HP series has solid walls about half way up, then mesh. It's also slightly lighter than the Hubba.) It's still not a true 4-season tent, and I wouldn't take it outside the light winter conditions we use these kinds of tents in - but it is a nice tent.

(Later) I just found out that MSR has discontinued this tent. Pity.