Aside from Crye, Propper and Tru-spec, there's
Dropzone and
UR-Tactical.
I've got a set of the UR-Tactical BDU's and love them. I find them to be a better design than the Gen.1 Crye BDU's. I've seen the Dropzone ones and they are realy nice and very well made, but they are pricey for a BDU, especially for airsoft.
If cost is an issue, I'd get a set of the Tru-Spec TRU's. I wear the pants (non-camo) daily for work and they're great.