Need to replace pump

[madgame8]

hi, I am also in a similar situation in need to replace my pump. Here is my setup:

1) Hayward dual speed 2 HP pump using 230v and 9.1/3.4 AMPS (Model SP-1615-Z)

2) ~26000 gallon concrete pool

3) 1.5" incoming and return pvc pipes

4) Pool is approximately 15ft from pool.

5) Nautilus FNS 60 filter

I also use a Polaris automatic cleaner. What brand and HP would recommend to save electricity. I probably would only use the pool a few times a year. A pool repair guy suggested that I get a new Pentair 3/4HP Whisperflo pump and would do it for $625 total with labor. Anyway I can do it for cheaper? Also I am a total newbie when it comes to pools but I am willing to learn as long as the mistakes are not costly.

Thanks!