If you want something more affordable, you could try a semi-custom home from Scott Felder, Wilshire, Taylor Morrison or Partners In Building. There are tons of builders in Austin that can take a standard floorplan and make slight changes to create what you need.
I wish you the very best!
I noticed all of your recommendations were for architects. So, I thought I'd offer another option. Design-Build has the benefit of giving you a guaranteed cost estimate before you get the entire home designed. Plus, you get the benefit of having a builder "on your team" during design. So, all those years of experience in a lot's buildability are brought along into your design, rather than after the design is complete.
Our design-build program can be seen on our website http://(www.NewHouseBuilder.com). We have architectural designers on staff who have degrees in Architecture and who are absolutely amazing at creating the perfect design for your lifestyle.
If, however, you choose to go with traditional design-bid-build, we would be happy to work with your chosen architect. We have worked with almost every architect listed in the responses, and agree with everyone's comments here. Good luck! -Bethany Jenkins, Jenkins Custom Homes