My suggestions based on personal experience...
* If you need authentic, well-worn phrases/swells/falls/chord voicings/etc. then consider a loop/phrase library... Zero-G Phantom Horns is cheap and good, Ilio Memphis Horns is good too and at least the audio CD-ROM version is cheapish...
* Chris Hein Horns... lots of horn types, articulation, scripting... if you don't need the massive full product, you can buy individual horns & sections here:
http://www.soundsondemand.com/ (search for "chris hein")... he also released "CHH Compact", which is a cheaper slice of the overall product line... FWIW, I think a small chunk of Chris Hein Horns were used in the Kontakt 4/5 factory library, IIRC...
* Vir2 Mojo ... has some features for humanizing playback, if you don't want to be bothered with making your tracks sound human the old fashioned way...
* Wallander Brass... designed more for orchestral, but certainly capable of most styles... also has a cheaper "Wivi Band
" product... Wallander is nice because everything is modeled, but keep in mind extensive control over model params is only available in the more expensive player
* Sample Modelling... the older Kontakt-based brass and saxes and the newer "SWAM" based saxes are all excellent, given what they attempt to replicate...