I have to make a very difficult decision...

First off:

Purchasing newly released Neo-Geo games is generally not worth the cost unless you have considerable amounts of money to spend, since the Dreamcast/PS2 conversions are more than adequate. Consider that you can probably pick up a Japanese DC with MotW and at least two KOF games in good condition for the same price as one Neo SvC/SSV Special/MotW cart.

SvC is IMO NOT a good representation of either company. In fact, I would say that it is the *worst* big-name 2-D fighting game since... well, the first CvS, and that felt like a half-baked Beta version to begin with. If you want to play it, I suggest you get the PS2 version.

MotW is a much better choice. It is the only Fatal Fury game I do not own the Neo version of, but that only stems from the price. Again, I recommend that you track down the DC version and spend the rest on older Neo titles, like the Real Bout games or KOF '98.

As for SSV Special, I have not played it, but from what I have heard, SSV (which AFAIK will be released for the PS2 on July 29th - in Japan, that is) is just as tremendous a disappointment as SvC. "Try before you buy", say I.