Return pump sizing

Little giants are good pumps too for AC. I have a super old 4-MDQX that still amazing after many years. Will last this long if you maintenance it properly.
 
What kind of flow will I need at lets say 15’ head, I did not realize I needed such a large pump
I’m looking at a vectra L2 at $470, a ikwai md55rlt at $360, panworld 150ps $259
Max flow3100, 1104, 1100
I guess I just don’t want to go too small, any input?
Thanks in advance
 

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