1500' is the 'industry standard' circuit height in my experience - no particular reason, just because it is 'comfortable' I guess.
So whatever minima is published on the app chart you go by that of course
- not sure which minima you mean? If you are flying into an airport 'visually', apart from any ATC etc limitations you can come in at which ever height you wish. If you are flying an instrument approach for a circle then yes, you use those minima.
R13 at EPSC must either be purely 'circle only' or perhaps ATC radar (if any) might position you for a SRA. It might even have PAR, I cannot find details.
I suggest you set CAVOK and enjoy! Try a run in and break on 13
