Well, you should get the x-ecutor ver2. It basically does the same, but is cheaper and has better bio's. (unless you flash the x-ecutor bios onto the xodus).
Check the chart here
http://www.xbox-scene.com/modchips3b.php
It's basically better because you can flash more than 1 bios onto the chip, also, the x-ecutor v2 lite is pre flashed, so you don't have to flash the bios yourself. So it doesn't really matter which chip you get, but I reccomend the x-ecutor lite, because all you have to do is install the chip. No need to mes with flashing it.