Here's what you want:
Either a 2 speed Super Pump with a toggle switch (~$500)
Hayward SP2607X102S Super 1hp Dual Speed Pool Pump
Or a VS Super Pump with a surge protector (~$750)
Hayward SP2600VSP Super Pump VS Variable-Speed Pool Pump @ Amazon
Intermatic PS3000 Pool and Spa Surge Protective Device @ Amazon
If you have a LOT of thunderstorms & lighting in your area, you should ALSO get this:
Intermatic IG3240RC3 120/240 VAC Surge Protective Device
-------------------------------
The electronics on VS pumps is sensitive to lightning related voltage surges. You should NOT install ANY VS pump in Florida or other areas with lots of lightning, without installing a pool rated surge protector: replacing the electronics tends to run 80% of the cost of a new pump.
Either pump will save you money and be MUCH quieter. If you install the surge protection with the VS pump, both pumps should be reliable and long lasting. I'm not sure whether the VS pump will save more once you figure the additional cost, but it is more efficient.
Both pumps should fit directly into the space you have. If you get these unions and this pipe dope:
Spears 497 Series PVC Union with EPDM O-Ring, Schedule 40, 1.5"
Rectorseal 31631 1/4 Pint Brush Top Tru-Blu Pipe Thread Sealant
you should be able to do a drop in replacement. I'd recommend getting 3 unions, unless you are skilled at PVC fittings; it's pretty easy to get glue into the union joint and ruin it. Remember to cut out about 3/4" to make space for the additional length the union will add. Buy PVC cement AND cleaner locally, but get a US brand like Oatey, Rectorseal or Weld-On.
-------------------------------
Do NOT get a Pentair pump: Pentair has drastically slashed the warranty on consumer purchased and installed equipment!
Continue to chlorinate daily.
Hope this helps.
Bookmarks