I'd wire them the VC's on each sub in series (creating an 8ohm sub). Then, I'd wire them in parallel to the amp for a 4ohm mono load.

I'd then go with a 2ch amp and operate it in bridged mode. There are many, many out there to choose from.

What are you looking to spend?

1999 SVT #900/2760
Born on 1-20-99
Silver Frost/Midnight Blue
A few aesthetic and audio mods