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In your scope a 15mm ep will give 80x (1200/15). As Saturn is currently about 16.3" is actual size, at that power it's apparent size should be about 21'. So in your scope it should appear about 2/3 the size that moon would to the naked eye (the moon is about 30' in diameter)
And that is just the planet not the rings. Given this it may not have been Saturn, my suggestion is you were looking at Mars, which is in the same area of sky and would appear distinctly reddish.
With your eyepieces, the 25mm is most likely a plossl rather than a superview as GSO (and hence Bintel) do not make a 25mm Supervue. For most objects except planets the 25mm plossl is your best friend, nice wide field, good eye relief and it costs nothing extra! My advice to beginners is use the eps you have before spending cash on more exotic ones as in many cases they are perfectly adequate. And the same goes for barlows.
Cheers
Malcolm
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