I'd probably rate CH Horns just a little higher than Mojo, but the difference is very slight, and both are very useful for all sorts of pop/rock/jazz settings.
Depending on your experience writing horn charts, and using complex libraries, you might also want to look at Session Horns from NI again. The demos I've heard from a variety of folks have me taking a second look! It won't replace a full library like CHH, but for quick mock-ups it looks very cool indeed.
For more orchestral settings I'd also take a look at the Cinesamples brass libraries. But that's OT<G>...