Pier height for 12.5" RC

I am building an observatory out of a HomeDome 6' (with the tall walls), a Paramount ME and and RC Optics 12.5" scope. Can someone point me to the steps that I need to go through to determine the "best" pier height for this combo? I will be doing no visual work, 100% CCD. Would you use the tallest pier that allows the scope to fit in the dome (I assume that would allow viewing closest to the horizon) or is there rationale for making the pier lower for more stability? Any help would be appreciated.