Thanks, Ian, that's helpful.
From my experience, I'd suggest a close look at the Tarptent DW Moment (one-person). It has 2 vestibules and two wide doors. Both doors are made of mesh. The tip and the toe of the tent are two triangles, also of mesh, with closable flaps. The fly is vented in two spots at its peak.
I've found that the tip and toe triangles, left open, provide good very ventilation, esp when aligned with the wind. If I leave the flap of one vestibule open as well, that's more than enough ventilation. When I've camped in temps below, say, 10-12 with wind, I've found I have to close both vestibule doors most of the way -- in those conditions, the fore and aft triangles gave sufficient ventilation.
One consideration: The basic Moment is not free-standing. Tarptent does sell a fore-and-aft crossing pole, however, which converts the tent to free-standing -- although I always use the two fore and aft pegs. I've found the crossing pole to be very handy however: it ensures ample space betw fly and inner and generally adds tautness to the tent when pitched. I've also found it to be handy when I rig a tarp (as I always do if I expect rain at night) -- the crossing pole serves as a prop.
One detail on the poles: I opted to use the standard alu poles for both the main hoop and the auxiliary crossing pole. If I were doing it again, however, I'd opt for the more expensive carbon-fibre for at least the main hoop pole. When the tent is damp or wet, the alu sometimes binds a bit when I thread it through the tunnel to erect the tent.
Cheers, John