Good luck. Its going to cost you more than $200. You need a massive heat sink, large host, 2 drivers, high quality battery, and a special AR coated lens to get to the 2W level.
Do yourself a favor an build your own. Its not that tough, and all the info is on the forum.
With 1.6 watts you will have a longer duty cycle, longer battery life, longer diode life and you wont be able to see the difference unless they are side by side.