Some of this stuff may not fit everyones idea of what a big band is, but if there's more than 8 players and some jazz influences are apparent, it works for me. Anyway here are a few i'm hanging onto:
Maarten Altena/Quotl
Ken Schaphorst Big Band/Purple
Either Orchestra/Radium, More Beautiful Than Death
Vanguard Jazz Orch./Music of Jim McNeely
Octurn/Dimensions
George Gruntz Concert Jazz Band/First Prize
Patrick Zimmereli/Octurn
Orange Then Blue/Hold the Elevator
Gil Evans Orch./Tribute to Gil (the Hendrix ones are fun too)
The Now Orchestra/WOWOW
The New York Composers Orch.(all)
Orkest de Volharding/Trajekten
Circulasione Totale Orch./Accent
Pierre Favre/European Chamber Ensemble
Anthony Davis/Episteme, Undine
Edward Vesala/Nordic Gallery
Orchestre National de Jazz/Charmmediterraneen
Paul Termos/Death Dance of Principles
Frank Zappa/Grand Wazoo
Per Henrik Wallin/Tiveden
Norbert Stein Pata Orch./Die wilden Pferde der armen Leute
Magali Souriau Orch./Birdland Sessions
Ardvark Orch./Steps Out
Clubfoot Orch./Metropolis (all are good)
Rene Rosnes/ and the Radio Danish Big Band
Umo Jazz Orch/Transit People
Absolute Ensemble/Absolution
Neufeld Occhipinti Jazz Orch./NOJO