well SPL choice, the problem with ED vs other amps is the quality. If you can get a better quality amp with a difference of 100-200w rms from the ED, then it's not a good deal cuz the ED has good quality, good output and the tremendous warranty we all want in a product.
I don't thik there's better for 315 with 3 year warranty.
For that money, in output, an autotek mm 1400D or kicker kx 1200.1 but again i'd pick the ED just for the warranty. Unless you find a cheap KX and plan to run 0.5 ohm in the future.
it can, but i wouldnt recommend it without some modifications to the amp to that it could support .5 for a long period of time. i have seen it ran for a month without a problem