Standard suggestions are Epaulet Walts and Howard Yount trousers, for value and quality. I have one of each and like the fit, though for me, HY fit more cleanly in the back.. They are often sub$200, but you can get them for less during sales or in the B&S thread (as I have been able to do...some HY trousers were posted there recently). The Donegal Tweed trousers at HY look quite nice (I think there is an orange/brown of the same fabric at Epaulet).
Thanks for the suggestions. I think I'm tending toward HY and Kent Wang.