REI brand tents are never quite cutting edge, but their newest tents always borrow liberally from whatever tent design was considered best two years earlier and they generally represent the best value per dollar spent. REI does not make a single wall tent, but their recently revamped Quarterdome series of tents are very decently designed, lightweight and good quality. They also carry MSR and Big Agnes tents, as well as several more brands to choose from.

I use an REI Quarterdome 1 solo tent and am very pleased with it. As AdventureMyk notes, the guarantee and return policy at REI is excellent; it's probably the best thing about them.