I would def try out the base game first before committing to purchasing any expansions or kits. Even though the game is old, EA keeps those expansions at full cost. There’s been enough added that it should scratch the itch and give you an idea if you want to invest in more. The expansions I would recommend first are Seasons and Get Together - adding weather and holidays helps with immersion and being able to have clubs and control how sims hang out more is a plus. Life & Death and Growing Together are great expansions for fleshing out interpersonal relationships and getting really unique sims.