Okay... so let's see here... my candidates are:
Sigma EF-530 DG ST
Metz 48
>>> Is this the same as the Metz 48 AF-1? Because I've already used this flash and it seems to have problems with correct metering. I usually shoot in Av and the shutter speed rarely adjusts relative to the position of the flash, the focal length used, and other settings in the camera...
Sigma Super 500
Pentax AF280T
oh... and oranges... and flash powder
lol.
Since I've used the Metz48 AF-1 as borrowed from a friend and used it, I'd say it is quite decent. Like I've said though, I just have problems with it since I can't figure out how to use it properly when shooting in Av. It seems to have metering problems.
Then again, I wasn't able to borrow it long enough to play with it to the hilt.