Boomerang was Moomba's first attempt at a ski boat. It was entry level in features, but was very light weight. The slalom wake is supposed to be near nothing. I haven't heard about tracking or other issues. I know very little about the Kanga.

IMO, you can get into many different slalom boats for your price range. I would look for a boat with a long history and high numbers of production. Parts for the older moombas won't be as easy to find as for MC, Bu, or CC. I would also look at MC PS 190s, Sportstars, PS 205, Bu Response and Sportsters, and CC 196/206. All are great slalom boats.

Good luck in your search.