TomD said:
Doug, I'm aware of the design problems with domes, but it appears the odd space could readily be used for gear. I misspoke to a certain extent-I meant freestanding, but not necessarily a true dome shape.
I look at the problem in the other direction. First lay out the rectangle necessary for one or two sleeping bags and pads. Then draw a hexagon (or circle, if you prefer) around the rectangle--the resultant is rather large, particularly if you are trying to dig in on a snow slope. My 2-man dome, while roomy for one, risks the sleeping bag touching the tent at the corners of the rectangle. (And of course, I put gear in the side spaces.)
If you want free-standing, take a look at the REI Quarter Dome or tents of the same basic design. Rectangular footprint, relatively vertical sidewalls low down. Probably not as space-efficient as a tunnel, but tunnels aren't freestanding.
Hillebergs are pricey. If I could swing it, a Nallo2 GT with the huge vestibule looks like a good winter tent (not for climbing, but for ski touring). For one person for winter, maybe a BD single wall.
There has been some recent discussion of Hillenbergs on rec.backcountry by some very knowledgable people (eg Chris Townsend--the book author). They are very highly regarded, if you can afford them.
IMO, many solo tents are essentially bivy sacks with poles (or a nylon coffin, if you prefer). OK in good weather, but claustrophobic if you have to wait out some bad weather. This is where, IMO, the smaller 2-man tents (eg SD Clip Flashlight CD, REI Quarter Dome, etc) will do much better. Some even give you enough height to sit up.
Doug