Jim,
Fresh water pumps have so many different design characteristics that you need to determine what you want in a pump before buying one. The AquaJet pump in your coach is designed to deliver up to 5.3 GPM (gallons per minute) at pressures up to 85 PSI. It is a variable speed pump that is designed to resemble home water pressure characteristics. Variable speed pumps are much more complex than the traditional RV water pump and therefore they have a higher failure rate in all brands, even ShurFlo.
The ShurFlo Revolution that a lot of RVs are changing to has and internal by-pass to reduce the pulsations that are common in most RV water pumps except the variable speed models. However the Revolution model ShurFlo pump is rated at 3.0 GPM maximum at 55 PSI, so you will be trading performance for a lower cost and probably a longer life. Decide what is most important for you, and purchase the pump that fits your needs. One word of caution, the ShurFlo variable speed pump is larger than your current pump, so make sure that you have adequate room for mounting before purchasing that model.
Gerald