You could get a 4-channel amp and bridge it to 2-channels @ 4 ohms for 325W x 2 channels. For instance, Kicker has this one:
ZX650.4 - Kicker 4 Ch 650 Watt ZX Series Amplifier
I have seen this on on Ebay for around $265...just a suggestion.
Not sure if this works with the DVC but again...I'm not a pro.