In mathematical physics, *Communications in Mathematical Physics* is among the top journals I guess.

There are two other journals I would consider to be above average: *Advances in Theoretical and Mathematical Physics* and the *Journal of High Energy Physics*, which publish lots of high-quality mathematical physics papers, especially at the formal end of <code>hep-th</code>.  Of course, I have heard if mentioned in the past that, especially in US maths departments where they care about this sort of things, *Communications* is considered a mathematics journal, whereas *JHEP* perhaps is not, the jury still being out on *ATMP*.  Hence if you are a mathematician thinking of publishing a good paper in mathematical physics and want to publish in what potential employers might consider (however narrow-minded this consideration might be) a mathematics journal, then perhaps *Communications* is the way to go.  The quality of papers there is consistently above average.