Interesting build, mine is also ICF walls with a Steel SIP roof. The reason for choosing steel SIPs is numerous but as far as pricing goes, it all depends where you are located at, since shipping plays a part in the cost. I would contact Chris Kavala here on this forum and he can get you some pricing on steel SIPs.
I am going for a vaulted ceiling so steel SIPs work very well in such an application. Even though you are not designing with a vaulted ceiling, they can still be used but one needs to have a ridge beam to support & attach the SIP on the top end.
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