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How about Kansas?
https://fiber.google.com/cities/#header=check
LA and SD can be quite expensive as well depending on what area you're looking at. Move to LA and I'll get you setup with BizSpark. ;)
I don't know about rent, but Texas is very welcoming to Small Businesses right now, so you may want to check them out: http://www.texaswideopenforbusiness.com/small-business/
Good luck.
zoom, plz add me on Skype and we can discuss this. I am also a 3/4 full time indie dev and Ill be moving Stateside in June, and Ill be in San Fran for GDC in a week. I am going to open up a home that I am purchasing to other aspiring game devs and it might just fit your needs and give you some runway while attempting to go indie. There would be no rent payments and the other parts of the deal are negotiable.
Skype: davidjetguy
Also, shoot me an email at
games@daveottley.com