oh boyy!
G1- Chief, Springy & MGR ponies (and rowdycowgirl's mom's plushies are making their way into my faves)
G2- Ivy with the really long hair, Satin Splash (though I never had her), and... Petal Blossom? The same purple one that CC said
G3- OMG lets' see... Well all of the DIVAS of course, my favorites of which being: Merriweather, Minty, Marshmallow Cocoa, Wysteria, Snow' El, Hot Pink Skywishes, Pepperberry and Port o Bella...
And for non divas, I absolutely LOVE Minty, Pretty Pop and Beachcomber.