Max iops has toggle NAND (best quality), the other two are synchronous (second best). Other toggle drives are the Mushkin Chronos Deluxe and the Patriot Wildfire. Synchronous and toggle are supposed to lose less performance when filled up than asynchronous drives and cope better with incompressible data. Meanwhile, toggle drives hold similar performance at a given capacity as the synchronous drive holds at the capacity above, ie. the max iops 120gb is similar in performance to the vertex 3 240gb.
So, of those three drives, money being no object, get the max iops. If you are willing to look around a bit, look into the other two toggle drives. That said, all three seem to be largely the same (as all sand force drives of each memory type seem to be).
