What enclosure is better for me?

I am sure to some degree that question is a personal preference, but I'll give you a general layout of my situation. I *am* new to car audio. I have done a bit of reading(10/+ hours easily) and asking around in person at stores and such to figure this stuff out, if I am wrong about something please tell me, I won't take any offense. I can provide a link to all the equipment I mention.

I drive a 1998 Monte Carlo(Lumina look, yes, it is old lookin.)

I am wanting to put 2 12" Stage 2 Rockford Fosgate Punch Single Voice Coil Subs in. I am going to be running them with a mono-channel amp that from what I can tell will put out 150w RMS to each one (If you can help me with bein 100% sure please email me or catch me on AIM.)

I have been desperately trying to figure out if a Bandpass enclosure or Sealed would be best. I don't have much problem spending a bit more on the bandpass but I'm not looking for competition level (Look at the vehicle it's going into, not for competition.). Also I am going through Best Buy(I know, boo, but I like my ability to force them to fix my stuff if they mess it up.) so take into account the product they'd be giving me. If you happen to know a low shipping cost organization or a local for my area(Between Dayton and Cincinnati Ohio) let me know!

All help is greatly appreciate and welcomed!

I keep hearing a lot about distortion from ported designs and I was wondering how dangerous that could possibly be. If it isn't really anything I need to worry about, then I'd say bandpass is probably my best option.

A bandpass will sqeeze out every last db out of your sub it has.  The problems:  they have extremely poor sound quality, if not built for the sub (or if the sub's not built for it) then you can easily fry it, and when they do distort you cannot tell very easily because you usually have them slaming and they sound crappy anyways.  But if you don't care for the sound quality then yeah go with it, but as has been said, it's not recomended.  That aside, a sealed box is your best bet.  Especially if you're new to car audio.  Build one youself.  Not hard and a sealed is very forgiving on size differences (up to like 20% i believe).   And cost a butt ton less.  As far as distortion, like I mentioned earlier:  you can have a hard time telling with a bandpass box.  A ported will give you those extra db with a little sacrifice in sound quality.  But they shouldn't distort unless your amp clips or you've got way to much power running to them.

Go and get a good 500 watt rms amplifier for your two subs (combine not 500 to each).  I've never underpowered my subs.  You can always (well most of the time) run more then the factory stated rms value.  Mono or bidged 2 channel will do.  Wire accordingly.

Also: bandpass boxes are normally extremely big.  If you don't mind having only half your trunk space.....then yeah go for that bandpas.  A sealed is the smallest box you can build for your sub.

I've decided to go sealed. Here is a basic outlook of what my speakers are going to be:

2- 5 1/4" Rockford Power T152C 2-way (Door Speakers)
2- 6"x9" Rockford Punch FRC4369 3-way (Rear Deck Speakers)
1- Kenwood KAC-8401 4-Channel Amp (60w RMSx4)
2- Rockford Punch P212S4 12" Subs (4 ohms)
1- Rockford Punch P3001 Mono Amp
1- Sealed Box

I might get around to designing a bandpass sometime when I have a better understanding for what best fits the speakers, but I'll probably stick with sealed since the overall consensus seems to go that way and it was what I originally planned on. Thanks guys, lmk what you think of the speaker setup!

Or just one large box but make sure that both subs have their own sealed seperate spaces (they're so childish, have to have everything to themselves....sigh).     But yeah that's the general idea.