[jclark003]

Unless you have changed the house load (e.g. added an inverter) or had problems starting the engines I would probably recommend replacing with similar type and capacity batteries. A higher CCA on the start bank won't hurt anything and also won't cost much more either so it's really up to you. If you change battery type you will also need to change the charging profile on regulator and charger. as for brand I'm not sure there is much difference. I've had good luck with interstate, AC Delco and NAPA.