I'll echo the "try an emulator" sentiment. There are some damn fine games for the NeoGeo (Twinkle Star Sprites in particular is just a nutty but awesome concept for a two-player competitive shmup that I've never seen anyone else attempt,) but there's not a lot of variety, and in my case while I enjoy some of the titles it's just not enough to justify the investment it would take to get the real deal. Maybe you'll feel differently, who knows, but given the amount it can cost, I'd do some checking in first.