> Terra nova used to do something that seemed like it would fit the bill- it had a central porch with two sleeping bays either side of this. But I can't see it on the website now.
That design is called the 'vis-à-vis' (face-to-face) and in a four-man version, I think it's one of the most practical designs for activities like climbing. The shape stands up to wind well, using it for a team of two, you can share it with a climbing partner without having to occupy the same sleeping quarters and you have plenty of room for gear. Using it as a couple, you can do away with one of the bedrooms and use the space for gear or living space. It's very flexible.
Outwell do the 'Watergate' for around a couple of hundred, Skandika do a cheap version called the 'Hammer Fest' and Go Outdoors do a cheapy for £80. You can buy more expensive tents but that probably gets you lots of features you may not need and which may even be a pain it the bum.
I am in the market for a decent second hand item if this kind if anyone is selling.