Genesis is a bit of a continuity problem... Davros does call them the Mk 3 travel machine... but they have the solar slats of the later model Daleks and are free to leave the city... you kind of have to assume that earlier models are trundling around the bunker complex somewhere...
placement of the Dead Planet never makes sense either - the Doctor in DIoE says it was at the end of Dalek history and the reference books kind of latch onto that, but that doesn't explain why they are the least advanced of the early Daleks (simple budget/story telling and complete lack of a series bible aside)....
I suspect I've posted it before, but I started a massive Dalek army list, covering different periods and worked out a more logical timeline based on tactics/advances...