Help matching amp to sub

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Hello all, I'm looking at buying an amp and sub for my pickup and have decided on these.

Rockford

Prime R500-1 (320w x 1 at 4ohm, 500w x 1 at 2ohm)

Punch P2D4-10" 4ohm DVC (300w RMS)

My first question, is a DVC sub considered a single speaker or two? Can I hook this DVC 4 ohm speaker up at a 2 ohm load and be OK, or should I opt for a SVC 4ohm punch?

Also, I already have an amp installed for components, would it be just as good to run an RCA from the existing amp output or should I go from the head unit? I have three preamp outputs on the head unit (front, rear and sub), just didn't want to open up my dashboard again if there won't be a sound difference.

Thanks!

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anyone?