I do medium to large residential remodel projects, I use Cadsoft Envisioneer, have for quite a few years, since version 3, at the time I think it was $995.00 USD. Version 5 came out last year, it's now available in three different packages from $795-1795. It's has a pretty small learning curve, decent 2D drafting tools, comes with a basic builtin renderer,the biggest con is that it doesn't live update from model view to paperspace but this is suppose to be coming,the biggest learning curve and time spent was setting up the BIM catalogues for my use. I think its the perfect way for a one man show or small firm to get into BIM without breaking the bank. Here's a link, http://www.cadsoft.com/ . But I sure have been using SU alot more lately
Mike