I have had excellent service and performance from the many A1 Cardone remanufactured water pumps I have installed. Since I purchased them through a local auto parts store (O'Reilly), they came with a convenient lifetime warranty (when compared to having to ship old/new through the mail). With remans as with new parts, there is a chance that they may fail prematurely. I have replaced new Ford pumps in less than 40,000 miles and have had remans last over 100,000.
Upon close inspection, the sensors are made very similary. The Wells parts from AutoZone and the Borg-Warner parts from O'Reilly have both proven to be high quality components. As for price, you will have to check the most convenient sources in your area. After visiting the websites for both sources, here are the prices today.
Wells SU242, AutoZone/AZ.com, $55.99
Borg-Warner CSS54, O’Reilly, $57.99