Soundstream DTR1.3400d???? about $500 shipped on ebay... I think it does about 3000 at 1 ohm and at .5 it will do 3500.... I know someone who had 2 of these and ran them both at .25 ohms DAILY and they held up fine.... They are pretty reliable i would say... that was with stock alt too.
by comparing gut pics of the crescendo and the sundown 3k ... looks like the sundown is a little beefier..... has a few more fets and a bigger power supply..