Replacing old sand filter... Opinions please!

Well, your sig says you have a 1HP pump and your post says 1.5HP. If you have a 1HP pump, you would probably be fine with a 24" filter like the Hayward S244T. If it's 1.5HP, you may be pushing the limits of that filter and need to move up to a 30" filter.

What does the motor plate on your pump give for HP and SF?
 
You might be able to replace your pump impeller with one from a 1HP pump and reduce your filter size requirement. Might save money in the process if you don't mind breaking the pump down to change it.
 
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