Not so much the normal ones, but I have serious thing for some of the Halloween/character dress-up Kelly dolls.
Just this week I purchased Tommy as a Mummy and Tommy as a Skeleton! I'm planning to keep the collection small, but I absolutely need Kelly as a Bat (2008), Chelsea as a Skeleton (2011) and Chelsea as a Ghost (2012). The 2012 one is extra vexing - I managed to find black-haired spider (bought her, she's adorable) and the brunette witch (passed on her - there are much better Kelly witches out there) in stores, but not the ghost I really want!
I agree though, it was lame of Mattel to replace/stop producing Kelly herself. (And why don't the modern dolls have clearly identifiable names? I like knowing their names!)
There's just something about Kelly and friends, they're so little and cute, and dressing them up in costumes makes them fit right into my collection schema. The Merry Monsters set did me in, I had to have it. I originally spied them on Flickr and thought they were customs, they were so lovely and unusual.
You should post pictures of your collection!