Need sub suggestion for my Rockford amp

[BlackHawk1]

Hi. I have a Rockford Fosgate Power T600-4 amp. This is a 100x4 channel amp. It's running Focal 165 VB components up front. The other two channel are bridged (300 watts) to run a sub or two. The "birth sheet" for the amp claims it's doing 390 watts bridged. The enclosure will go in the trunk of my Toyota Camry. Because my local selection is limited I am looking at JL Audio and Rockford subs. What sub or subs would you recommend for me? I've had sealed boxes in the past which I like very much, but I'm not sure with my amp this will satisfy me. I may have to go with a ported enclosure to get an adequate sound level from my amp? I am thinking of (1) 12 or possibly (2) 10's. Your help is greatly appreciated. Thank you.