Pump Recommendations

What is the motivation for replacing the pump? Why not just get another Matrix? They come in a two speed as well.
 
Exterior rust is usually not much of a problem. Pumps either work or they don't. There really isn't much decrease in performance as they age.

How old is the pump?

Should the motor fail, you can just replace the motor. The wet end of a pump can last for many decades.
 
Unless the bearings are making a lot of noise, I wouldn't be too concerned. Bearing noise is usually a pretty good predictor of eminent motor failure.
 
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