Ok, here's where it stands. A few nights ago I did some reading and found that the MV-1B is considered pretty reliable when it comes to multi carts. I checked out eBay and found one for less than $100 so I took a chance and bought it. Two minutes later I get a pm from Troy (mtZRcade) who makes me a generous offer which I hoped I wouldn't have to take him up on. The board arrived yesterday and I hooked it up. Booted but with bad graphics on everything. Hmmm, I noticed when I put it in that one of the dips was set to "on" so I figured what the hell and switched it to "off". Works perfectly now! Sweet! Now I need to sell my other board which is 100% working and according to Troy (who I bought it from) it was nos, it sure looks brand new. To top it off, I received the NEO GEO marquee I ordered today and they included a Metal Slug X cart since it took almost a month to ship. I'm swimming in NEO GEO goodness over here.
One other question for anyone who reads this far, are there any must have games that aren't on the 161-1 cart? I mean, any completely awesome games that just aren't on the multis yet?