There arent really too many and all of them are fairly decent.
Checkout Kazuyas site for really good reviews to help you decide. <a href="http://www.neogeoforlife.com" target="_blank">www.neogeoforlife.com</a>
Pulstar is very good , R-Type clone , but it is very hard !
Blazing Star is another very good shooter but is rather easy , excelent graphics for MVS though.
View Point is pretty good but it can also be a very hard game.
Aero Fighters 2 & 3 are pretty good as well , they play alot like Raiden
Ghost Pilots is a rather bland 1943 clone , not too much excitment to be had there and its pretty hard to find as well.
There are a few others , these are some of the more notable ones.
Captain Tomoday is pretty cool too , strange but fun.