the most common ones you can find:
yellow box tartan plaid backs - very bright, a little garish - especially the Italian printing, which is high gloss lamination. If you can find a China printing, it's more matte, and a tad less bright.
Original RW - blue box, floral backs - more subdued in color - the new printings are glossy, if you can find an older one, they are more likely to be matte.
Universal - nice, but lots of boring while backgrounds
Radiant - a little TOO radiant, if you ask me
Pamela Coleman Smith Commemorative - gorgeous, superior in every way - color, cardstock, etc.
I have one of each, but if I just wanted to try it out, I'd go for the Original RW- Book Depository (free shipping) has it for around $12. Still, I think everyone should own the Commemorative deck. It's so lush and beautiful, the colors so soothing, satisfyingly weighty in your hand without being heavy...and that soft whispery sound the cards make as they slide across one another...it's like a religious experience just to shuffle it...