I'm in the DFW area and have been working with SIPs for over 12 years.
Both SIPs Texas and EH Systems are good guys to work with.
Where at in OK are you building? I do travel a bit to install SIPs, and you project sounds like one I'd be interested in.
Check out my website:
www.marksonbuildersoftexas.com
Or send me an e-mail
[email protected]I'll put you in touch with the guys you need to talk to to get the best deal on panels.