Alternatively, you could simply purchase one of the new, light single-wall tents on the market. I just got back from a weeklong bike tour in which I slept in a Mountain Hardwear Waypoint 2 ($250; www.mountainhardwear.com). It uses good design to ventilate, not high-tech fabrics (although it does use a high-tech, super-light silicon-coated nylon). Even with two of us in the tent, condensation was minimal. And it kept us dry during a four-hour downpour in Yellowstone National Park. Its three-pound, seven-ounce weight is fantastic. The lack of a vestibule is a downside is, though. For that, try Marmot's similar AT, which is a touch heavier at about four pounds but costs only $179 (www.marmot.com).
The Bibler Megamid ($178; www.biblertents.com) is a single-pole, fly-only tent. No floor, which sometimes is a real advantage. But, it has somewhat limited utility and I'd probably carry a Waypoint before I'd carry a Megamid. The GoLite Den 2 ($199; www.golite.com) uses the same principlea non-breathable single wall designas the Waypoint or AT. It's a fine little tent, but I think both the Waypoint and AT have a more practical design with no real weight penalty by comparison.