Given your expected uses, I think you're on the right track. The Gemini ES seems like a pretty good fit. I like the fact that they've added top ventilation, and the twin vestibules are great (if only to keep the porcupines from gnawing your boots and pack straps!). A footprint/groundsheet is always a good idea to reduce wear and tear on the floor.

MEC has a pretty good rep regarding the quality/durability of their house-brand tents. And if there's a problem with their gear, they really do try to make it right. (I bought a MEC 1.5-man late last year, but haven't had a chance to use it yet. Sigh.)

Let us know how things work out.