Malibu is one of the "Top Three" boats known in the waterski and wakeboarding world. What does that mean to me. They have, in the past, done a lot of R&D in boats and created new models more often the the average. They also spend a lot of money on advertising to get their name out. They use Indmar engines, have a strong dealer network, and are of good quality.
Sanger and Calabria are two smaller boat companies with a stronger presence on the West Coast. Sanger has made a name for itself as a barefoot boat. I don't know enough about them as far as dealer network or overall quality to make a proper eval. I would strongly suggest that you do research on both prior to making a purchase.
Moomba is also Supra (under Skiers Choice and made in the same building). Moomba entered the market in the 90s as a budget boat (and it showed). Over time, they have improved quality and workmanship. If you research the materials used by Moomba, you will find them to be the same as MC and Malibu (Engines, gel coats, carpets, guages, etc). Moomba has a large dealer network and is (Skiers Choice) in the top three in boat sales.

I purchased my 2008 new. I have had one issue with the ignition switch ($20 repair). When comparing to my 1999 Malibu Sportster that I purchased new in 1999, the Moomba has better build quality(IMO). Of course, that is kind of an apples to oranges comparo. I have gotten more than expected in terms of quality. While I understand bling costs extra money, I can't understand why a similar CC or MC retails for about $20K more.

Given your options listed, I would chose Malibu or Moomba over the other two. MC and CC also make quality boats and would recommend those also. Determine what watersports you are trying to do and your budget. Then making a boat choice gets easier (or sometimes, more difficult). Good luck