People forget that site preparation is a HUGE component of pool installation and don't figure it into their planning.
However,
$5000 for an 18' round seems HIGHLY excessive. But how much of that is getting a level surface--if $2500-$4000 of that is getting the level pad, because of excessive sloping of your yard, that may explain it--but only if you are building UP, not digging down. The pad for my pool cost $5000, but I was building up as much as 2', and needed to support a 16x40' pool. I needed lots of retaining wall block, gravel, fill, and drainage. So the pad is over 20' and 45' long.
Builders like cartridge filters, but you will be just fine with sand or DE--less hassles too. A 1 hp up-rated filter (2 speed) is probably as big as you should go.
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