Genesis is good too, I shouldn't have said "by far and away the best"
DonPachi
DoDonPachi
(the best Taito stuff)
Darius Gaiden
Galactic Attack
Radiant Silvergun
Gunbird
Thunder Force
Get ready to shell out some cash though. Saturn is a collector's console.
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http://www.youtube.com/watch?v=7MwZfXy9mA4
http://osu.ppy.sh/stat2/shinytentacool-0.png