I wouldn't even wait for the full release. In fact, I wouldn't install it at all.
A friend of mine had a host of issues regarding SP2 screwing up some of his programs. He ended up reverting to SP1 but spoke to his MS rep (he works as the tech lead for a BB store in Woodbridge) about these issues. It was only after several fixes for SP2 in which he, and I finally downloaded it.
So I won't be that quick to download SP3, but I will wait for a bit to see how acceptance of that service pack goes.