Moomba Outback LS Mastercraft x7/9 or Moomba Mobius? ($30k)

Okay, another lovely "which boat do I buy" thread. (but hey, you DID click on the boats and accesories topic, right?!) I've got a budget of about 30k.. and seem to have plenty of options in the 5 years and younger catagory. My previous boat, I've just had it with, it ate another belt last night, and that was kind of the last straw. (its 8 years old). It was a flat bottom, 20ft closed bow ski boat that we did some wakeboarding behind (it has a tower) and slalom. I'm a slalom skier that doesnt go over 30mph/15 off, so a low wake in the mid 20's is what I need. My wife is an avid wakeboarder, and we've been using sand bags for ballast. I have spotted a 2009 Moomba Outback with just 10 hours on it for 29k, Seen a 2005 Mobius for $25k, and a 2009 MC X-9 , for 28k. All in the running. Is the mobius going to have too big of a wake empty for a good slalom run? Is the outback going to have too small of a wake for boarding? Is the MC going to have too large a slalom wake all around? How about an X-7? Any thoughts?