I've been doing quite a lot of research on tents lately. If you want a good read, request a catalog from Hilleberg (it's more than a list of tents - it's more like a tent handbook, erm, tent porn more like), or check out some of the information pages on their website, e.g.

http://www.hilleberg.com/BuildingtheBest.htm
http://www.hilleberg.com/FabricsandMaterials.htm

Look down the right side of either of those pages for more info links. Yes, these are ads for Hilleberg, but they are also eye opening because of the attention to detail. One tent may look much like another, but it's the little things that probably matter, such as how the seams are sewn, what materials are used, what type of zippers, etc.

They are way out of my price range right now, but when I can afford it, I'm getting one of these! Probably something like the Allak.

Neil