When Harry Met Sally is my number one rom com and movie, always. My Big Fat Greek Wedding is another one I love. Recently watched The Wedding Planner (Jennifer Lopez and Matthew McConaughey) and loved it. Runaway Bride (Julia Roberts and Richard Gere) is also good.
I Want You Back, When We First Met, No Hard Feelings are enjoyable. Romancing the Stone was great, you can also watch The Lost City (Sandra Bullock and Channing Tatum) which has tons of parallels to Romancing the Stone.
This time of the year I always try to watch Lovehard, Serendipity, While You Were Sleeping, and The Holiday.
I don't know if this (or any of the above recs) are what you're looking for but Much Ado About Nothing (1993) is in my top 10 favorite movies.
