try http://www.electronicgiant.com and refer to the eclipse amp you can get there big one pretty cheap like high 4's i think.
Other then that the viper line now being discontinued is going down in price on ebay for like 600. You'd probably be good to go with two xtant 1000w there 250$ a piece through our wholesale catalogs.
Go With the Power Acoustik A3000DB. 1800 at 2 Ohms. Can get it for a little under 400 shipped. I got two and they are awesome for the money. But i got em wired at 1 ohm and the put out 3000 at 1ohm. Just a suggestion though.
and alot more money involved //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif I think im gonna have to go with a 1500-1600W amp instead since not too many ones i want that do 1800W. @ 2 ohm of course/