I've touted Cinema4d here on Method before, and it just keeps getting better and better with the announcement of their latest version, r14. You'll notice on their modeling page there are a few videos showing architectural modeling, although basic, as the basis of some of their new tools including redefining workplanes and the use of guides. These have been staples of architectural modeling for years in other programs and I'm happy to see them being incorporated into Cinema4d.
With improved and added tools such as digital sculpting, camera matching and tighter integration with leading third-party applications, R14 offers the innovation on which individual artists and design teams have come to rely to create compelling 3D content for any medium - from film and broadcast to architectural visualization and mobile games.
The reason I love using Cinema is because it is just so much FUN. It's a great digital playground to play in.
A demo version of r14 is available here.