Have you heard about the Rocky Mountain Plan Company?
This internet-based group was established as an extension of LGA Studios to provide pre-designed drawings. There is everything from conceptual to complete plans available to purchase, some of them previously built and others new and innovative. In addition, Rocky Mountain Plan Co sells plans by other designers such as RanDesign and 3 Trees Design & Drafting.
The Rocky Mountain Plan Company is relatively fresh, so the design library is still being built. However, Heather Attardo, who has done much of the legwork in beginning the company, has begun posting the newest designs on the company blog.
These plans could give you the start you need in designing your house. Maybe you'll even find the exact home you have been looking for there!