pump and filter for 27' Venture

Either pump would do fine. For the filter, check the chart in Pool School, and if it is about double the effective filter area, it will work fine. General consensus around here is to go with the largest filter you can afford.
 
No, IG or AG does not matter for filters. The diff between pumps is that AG pumps are usually not self priming because they are below the water level and therefore gravity takes care of that. You can use an IG pump on AG.
 
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