I'll throw in a vote for the 285 also, it has 4 auto stops and manual powers of half, quarter and 1/64 (maybe 1/8, but to check that I'd have to walk :-) )

I'm not sure if a flash can be too powerfull, more power means more distance, being able to bounce further and with smaller stops for more DOF (If needed) . I also have a metz 45-ct1, this has 5 auto stops and full power manual, there is an add on which will give manual power steps.