2002BlackMP5

I am completely at a crossroads about my sub enclosure. I have a Crossfire P112 (12" SVC) being pushed by a Crossfire TEK75.2 (150 RMS @ 4 ohm). I have always liked sealed enclosures more, but since I am doing a single sub should I put it in a sealed, ported, or bandpass. I have never used anything except sealed before in my own vehicle. Also, if I do go sealed should the sub face upward or to the rear? I need to know what will sound best so I can make plans for my amp rack, etc. I have never done any Protege5's before so I will count on you guys for guidance!

Thanks!