Hi StKaAllen,
Based on your information … I would call this good value.
I am a little hesitant with both a wire grid foundation and a solid surface foundation for an all latex mattress (for different reasons) but having said that the solid surface foundation they offer also seems to me to be good value (depending on how it is made and the type and thickness of the surface) so if you are comfortable with the slight additional risk of a solid surface that is less ventilating and it seems to be well made and strong then it would probably be worth considering.
Other good foundation options are listed in the foundation thread here.
Phoenix