Looking for a pair of Subs, 1ohm

Kove speakers are quite good for SPL applications.  The ones PE has available are a buy-out from the 2000-02 model design and are perfect for your application, IMO.

My recomendation is to go to a shop in your area and have an enclosure built to the right size specs that will properly fit into your vehicle.  That's the best way to go.  There are enclosures available for mail order, but by the time you pay for the "box" and the shipping you end up close to what a local shop would charge you.  Plus, by patronizing your local shops you will generally get better build quality and a local warranty, you'll create a relationship with pros in your area that can really help you out in the long run, and you can be sure it fits into your vehicle.

In general the difference between sealed and ported is sealed is more musical and creates higher SQ while ported is more boomy at specific (tuning) frequency and creates higher SPL for the same power input.  This is a gross generalization and not always true, but will give you an idea of the difference.