I have combined 2c-c and 2c-e together, was quite an interesting experience, had 2c-c first... then within about 30 mins or so we had some 2c-e. I always find that 2c-c give me a nice fluffy floating feeling which is quite pleasing, I never experience a whole lot of visuals on 2c-c, that's where to 2c-e took place.
over all it was about 20mg give or take of each, maybe a little more of the 2c-e.
the only other combinations I have had with 2c-e are:
2c-e and LSD
2c-e and mushrooms
2c-e and mdma
I'm sure you will have a wonderful time with 2c-b and 2c-e combined.