If your computer can already handle Pets and Seasons well, these are the two heaviest ones, chances are it will do fine with IP. It's the Isla Paradiso world that comes with the EP that is broken, not the pack itself, but either the world can be fixed up before playing it or the content can be used in other worlds (up to a point, deep sea diving lots require water that is deep enough to handle them and not all worlds have waterways wide enough to accommodate boating properly). Resorts can be placed just about anywhere.
All a matter of playstyle, but I find myself using Ambitions content much more often than IP. And what, no love for WA or Supernatural? Those are excellent packs in their own right as well. :)