Another amp suggestion could be the Carver Pro ZR1600 I have one powering my .5's. Alot smaller than yours but power in spades. I am curious if it would still be enough for you ;)-~. It's 600watts x 2 into 4ohms. It's a pro amp so it has 1/4in. phono plug inputs, that you would need a mono phono plug adapter to run your RCA's into(to avoid hum). Or have a custom cable made for your needs.
This amp has been especially sought after by Maggie owners for it's tube-like qualities and overall power. I bought mine used on Ebay for around $550 a couple years ago.
