I recommend single-wall tents. The technology really HAS changed, and today you can get a single-wall thats light, storm-proof, has fewer condensation problems, and doesnt necessarily break the bank. Ive had Black Diamonds two-person Lighthouse ($379; bdel.com) out on three trips this summer and like it a lot. Its very light (under four pounds) and storm-proof. It uses Epic, a coated fabric that has just enough breathability to ease condensation issues, and has a design that encourages ventilation.
But as you note, you need something larger. The Lighthouse is a bit friendly for two, let alone three. Black Diamonds Skylight ($450) sits in that big-for-two-enough-for-three niche, and uses a combination of double-wall (for the front) and single-wall (for the back two-thirds) construction. Weight is around five pounds. Not cheap, I grant you.
Id also recommend Mountain Hardwears Airjet 3 ($320; mountainhardwear.com). Mountain Hardwear uses a totally waterproof siliconized fabric and relies on ventilation to reduce condensation. In my experience it works pretty well, although on a still, chilly night, youre still apt to find some moisture in the tent. The Airjet also comes in at around five pounds and has plenty of room for two with sufficient space for three. And the price is a bonus.
Double-wall technology continues to improve, too, with lighter materials and better designs. Marmots Aeolos 3P ($365; marmot.com) uses lightweight poles and fabrics to come up with a tent that holds three comfortably, and has bomb-proof canopy-and-fly construction. There still are advantages to such a designyou can remove the fly for better ventilation, and when compared with single-wall tents, double-wall tents are warmer in cool weather and cooler when in the sun. The Aeolos weighs about seven pounds, which isnt bad for a three-pack tent.