£300 would get you a couple of Metz 45s...you just missed out on two from me for £50! Too late they are gone - but you could look for some more. They will work with any camera, and with your gun on the shoe, a couple of optical slaves an dyou are in business.
i would think you could get lights that work for less than your budget. If you want automation, or fancy goodies, then that will get you one flash.