On a somewhat unrelated tangent, I was idly wondering if it would be a good idea for SNKP to release a bunch of its classic 2D fighting games on a single release and enable XBL for all of them. At least outside of Japan and Mexico/South America, they're suffering from a severe publicity deficit, and letting people have their choice of a whole bunch of games they'd ordinarily never play. Could even include a general online channel interface for the game, so you can see that 'Joe is looking to play someone at SS3', 'Steve is looking for LB1', etc. IMO, SNKP's biggest problem is exposure. They need to get people outside of their established regions to start playing their games, and selling titles like KoF 03 and Garou at $50 isn't going to cut it.
Even Metal Slug with netcode could be quite popular, especially with limited continues.