Radiant Silvergun is the king of Saturn Shmups, as I hear it. Japanese only, though, and it's been announced for XBox Live. Really, though, if you're getting a Saturn make absolutely sure you can find a way to play Japanese games. There are simply a huge number of games never brought over to the US for the Saturn.
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"Principally I hate and detest the animal called man, although I heartily love John, Peter, Thomas and so forth" - Jonathan Swift
BT with the victory!