Tons of great games were made for the Saturn that sadly never left Japanease shores. I'm gonna list some titles that  I would seriously reccomend importing. I don't know every Saturn game ever made off by heart & I may miss some out so by all means jump in with your own sugestions.
 
First I'll get the obvious ones out of the way like Radiant Silvergun & Princess Crown, they're the titles that most people will mention when talking about Saturn imports. Both are great games that really push the systems abilities & I wholeheartedly recommend you check them out! Also lots of Capcom games come to mind like: Street Fighter Zero 3, Vampire Savior, X-men Vs Street Fighter, Marvel Super Heroes Vs Street Fighter & Cyberbots. Though if you do decide to get hold of any of those games make sure you get/have a 4MB Ram cartridge or they will not work.
 
Got to mention the large collection of other (non-capcom) Fighting games such as Gouketsuji Ichizoku 3: Groove on Fight (Power Instinct 3), Asuka 120% Burning Fest, Astra Superstars & Real Bout Garō Densetsu Special to name a few.
 
Also Deep Fear is an interesting title that I would reccomend any North American gamers to get hold of as it was released in both NTSC-J & PAL territories only which is odd because usually in the "2 out of 3" scenario it's the PAL region that gets shafted.

It is just better to pretend the Saturn never existed.

There are way to many import only Saturn games to list but I agree with those you posted. I would add  Shinrei Jusatsushi Taroumaru (if you can ever find one of them). Good pics of it here.

" It is just better to pretend the Saturn never existed. "

" @wh4tshisface said:

" It is just better to pretend the Saturn never existed. "

Be safe kids, don't feed the Trolls :) "

The Saturn version of the original Dead or Alive is also pretty good & very different from the PS1 game, also it's one of the cheaper import games out there.