All three setups place the AimPoint at the exact same height (assuming you're mounting the AimPoint on the bridge of the RAS II).

The #38EX will give you more options front-to-back to mount your AimPoint, but it would be my last choice, as it adds a lot of unnecessary weight.

Of these three setups, I'd go with the RAS II, because you get a great AimPoint setup plus gain a free-floated barrel and much better cooling over standard handguards.  Using an AimPoint means that the RAS II bridge is not a liability for you, as it might be with someone who wanted to mount a conventional (long) scope.

-Troy