I currently have WCS, BSD, and FT. All 3 are great. I recently sold HS2 and I love cars!
WCS is so much fun for everyone, young and old. I don't care for actual soccer, on TV or in person. However, I love how soccer is integrated into this machine. Yellow card for warnings, red card for TILT. Just love hearing GOAL!!!! Also, it's a neat concept trying to score goals at the top of the PF and you protect your goal with the flippers. Getting to the World Cup isn't impossible, but not something you will get frequently either. My record is 11 goals during final match.
BSD, I'm still getting used to this game. It's difficult, easy to drain on both sides and down the middle, even though I have the regular flippers on mine. But when you get a good game going, man is it fun.
FT: Another one that is so upbeat and happy. Very fun to play. It's not a super deep rule set, but man, I love the artwork, the game play, the sounds. Just everything about it makes me smile.
I would look at the bang for the buck list and pick up any DMD game, trade it out when you tire of it.