Don't have much comparison of the Mondo vs. LSV, but some for the Mondo vs. OBV:

I was surprised at the boat show about how much bigger the Mondo appeared inside than the Outback V, which are basically the same length boat. White Lake Marine had them parked side by side and the Mondo cockpit looked to be about a foot longer than the OBV. Some of it may be from the bow area, but the sunpad looked about 8-12" smaller on the Mondo, so it appears that the engine packaging has been made more efficient (maybe due to the additional depth) so most of the increase in cockpit area came from that.

Thoughts on the Mondo vs. LSV:
One thought is that you mentioned the slalom wake has some importance. Aside from hull design, boat weight seems to be the next biggest factor in slalom wake. So I checked the boat weights, and was confused. The Mondo and the LSV lists at 3800# if you pic on the link to the boat specs. If you go to the compare boat page, the Mondo lists at 3000#. Not certain which one is right, but I assume the 3800# is correct, so in that case there is no advantage.

Not much help, am I!