You can get a Nissin Di622 MkII for around your budget. I've got 2 of the Di866's now but used to have a Di622 MkI which wasn't compatible with the newer bodies. Maybe have a look for Nissin on Google and see if the MkI is compatible, there was one in the classifieds for arounf £35 IIRC not too long ago. They are great flashes, very reliable and very conservative with batteries too, I had one set in a Di866 for around 800 flashes without taking to long to recharge.