The ZRS 1502 and 2002 are probably the best deal on Ebay right now, 124.00 for the 1502 and 2002 is 149.99 both are free shipping.
I have the 2002 I havent gotten to run it yet but it looks to be built well and has dual powersupply supposed to do 800x1 rms at 4ohm I bet its even underrated a little.
I have a old Cadence z1200-c 2channel that is rated at rms 750x1 at 4 ohm and it will run at 2ohm but no specs at 2ohm. Cadence has been around for many years and is a top notch manufacturer. They hold a 181 db record.