Back in the early days of microprocessors I was a big fan ot the Motorola MC6809, and MC68000 cpu chips, they were a pleasure to write code in assembler and creating an efficient compiler was an enjoyable task.
So lately I been playing (as opposed to a serious project) with the S8 family of chips and I'm considering also using the HS12 family, and finally the Coldfire family which are an updated MC68000 chips so I will be using them also.