Hey paul, I can recommend the lightforce 240Blitz from personal experience... very bright, light to hold (only does catch the wind a bit due to its large diameter), and has adjustable focus.
Are you using it from a vehicle or battery pack, 240 is only good from a solid power source.
Expect to pay $136 for the very cheapest I think doubleRcustoms has them in SA, but probably more like $165.
IMO: Even though I own a 240Blitz, the 170 is also a very good light and is only $108. Powerbeam are supposed to be a very good light too but are a bit heavier... note they are also tuffer.