Available for download for €25, the Jazz EZKeys MIDI track library offers tons of variety. Signatures include 3/4, 4/4, and 5/8 in both straight and swing. A range of tempo variation is also available. Whether you're looking to use this library for you debut album, or just to make some music for personal enjoyment, the value in this library is great.
You can get more information here: http://en.audiofanzine.com/midi-file-bank/toontrack/jazz-ezkeys-midi/news/a.play,n.15346.html