The Skittles breed of Dalek were pretty limited in number. One by one we've seen a couple meet their end, if memory serves.
Which Power Ranger Daleks are still* kicking about the Universe?
* Well, OK; "still" is a fluid concept. We jump around in space and time, and so do the Daleks, so we could say that — depending when we materialise — they're all alive, all the time (which, incidentally, is something that really bothers me about the Doctor deciding to fake his death). But we the viewers still magically seem to have a linear, progressing view .. so let's think in terms of televised adventures. :)