based on what you are looking for, I'd say mondo all the way. the obv will have a far superior ski wake, but the mondo should outperform the obv on every other angle: size(width in cabin), depth, handling in chop, surf, wakeboard and as mentioned, it's a much newer model so if you decide to buy a supra in the near future, depreciation should be better.

I'd take the mondo over the x2 anyday just based on the depreciation factor alone. the x2 is a solid boat, but most I have seen have ranged in the upper 70's new fairly well equipped.