I'm having our equipment pad professionally re-plumbed... also upgrading the pump to a variable speed pump and replacing our DE filter with a cartridge filter. The pool builder said he "has a pump in stock" but I would rather choose the equipment I want. Can someone recommend which VSP and filter would be best for my 15k gallon pool? I like the idea of the single cartridge filter and have read on here the Pentair IntelliFlo VSP is a great pump? I would like to provide the pool builder the exact models/sizes to be installed.