1st you have to specify if your cabinet is 8 ohms or 4 ohms
heads will generally put out about twice the wattage at 4 ohms than they will at 8 ohms
the head doesnt have to put out exactly the same watage that your cabinet can handle, a head that can put out 300 or 400 watts at whatever impedance (ohms) your cabinet is should be ok as long as you dont turn it up all the way, i woulnt get anything too much under 200 watts as you'll probably be dissapointed in the volume
with your budget i would look into used heads