Cerwin Vega would do for the speakers then. Ticks all your boxes and not expensive second hand. You'd maybe have to travel to pick them up though as there are not shedloads of them for sale (in the UK anyway).
I'd also say JBL but they are outside of your budget unless you drop lucky.
Amplifier choice is much wider as pretty much anything will work with them. A Sony from the ES range, perhaps? Plenty of power, decent quality of sound, used prices from £200 and up.
Current Lash Up:
TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.