All well worth seeing, but the Ronde is THE one for me. As you hav identified, on one of the Bergs, and then into a cafe for beer and frites, and the race on the television with all the atmosphere.
Also consider Ghent-Wevelgem, uses some of the same roads.
If you look in most Belgian (and many Netherlands) newspapers there is a list of races each day, you may well find a handy Kermesse or Omloop (larger circuit) near you on many summer evenings and at weekends.