If you play only with your friend combat mission b2b and combat mission ak are the turn based games you are looking for
. You can download the demos and try a game against your friend. You will probably like it.
Apart from CM which is only a 2 player game i know no other game that is so good in mp like dominions.
I fully agree that it is simply the best, despite it's small flaws (main problem is the low unit limit).