How do I know what pump/filter to buy?

How many gallons is your pool going to be?
I would avoid the Intex cartridge filters as they are too small and inefficient. One of the larger Intex pump and sand filter combos would work for most of the smaller AG pools.
Once you jump to larger equipment from there, I think the price goes up a fair amount and the combo units are usually poorly matched, meaning that often the pump is too big and the filter is too small.
 
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