Get a Sigma EF 500 Super. I have the old 430 Super on mine and it is a GREAT flash. And they are all set for the D and G metering and have all the bells and whistles one could want. At B&H it is $179.00 NEW. (note - the DG model is just for digicams...). It is rated at 132'/40m at 50mm. So it is well matched to the SB28.

And like I said, it is cheap and sturdy. My old 430 is still chugging along after being generally abused for a couple of years.