Well...you don't seem to have tried any Matrices, so I would say, buy yourself a nice DM6 or 7 if your lucky, secondhand.
In my opinion, and it is my opinion, DM markers and Egos represent the best bet.
I cant say much about the Mini, but I would only have an Ego or Dm as my main marker...would try other stuff and have had several other markers, but in terms of quality, performance, reliability and ease of maintenance, the Ego takes the crown, closely followed by the Dye Matrix.
The Ego wins for ease of maintenance, as there is simply less to go wrong with them.