Panasonic flash on X100 - FL28
I bought this flash a while ago. It balances well on the X100.
It has auto mode so is quick to set up and gives consistent lighting. Can bounce off the ceiling in landscape mode.
Canon 650D, Canon 600D, Oly E-pm1, EFS 15-85mm IS, efs 10-22mm, 24-70L, 100-400L, 24-105L, EFS 18-135 STM, Tokina 50-135 f2.8, EFS 55-250mm IS, 580EX, Hensel and Elinchrom studio lights, Canon Ixus 80IS