looking through Dreamvalley's pictures last year, trying to identify my old ponies.. I fell in love with the collector's. Having not been born until 1985 I missed out on the first wave of ponies, so the ones I got were second-hand. Blossom, Cotton Candy and Lemon Drop. Blossom will always be good because, even though I have 7 now, she was the first collector's pony I remember.
However, from the pictures I'd have to say it's Blue Belle, with Minty as a close second. Blue Belle seems the prettiest by far with her darker blue stars and matching hair and body.. but Minty is cool because my favorite plushie Care Bear was always Good Luck Bear, and she's so obviously like Good Luck.