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Regardless of whether you choose to go with a self powered line level subwoofer or with a custom enclosure powered by an external amplifier (w/line level inputs) you can still use your stock (OEM)...

Great choices!

My first choice for subwoofers were the JBL GTO 840's but the Polk's db804 that I picked up will get the job done.

Too bad you can't shoot the bastard if you catch them in the...

This might be a good starting point, it is a dual bandpass enclosure for two MM2084 subwoofers.

http://www.polkaudio.com/caraudio/subbox/subbox_plan.php?id=45&mesurements=standard

I would recommend removing your parcel shelf covering, adding some sound resonance material, opening the parcel shelf covering to match existing openings, covering it in speaker cloth and screwing it...

Thanks, I missed those!

I guess I could parallel the 4 ohms DVCs in each speaker to get 2 ohms load from each sub and power them in two channel mode @ 180 wRMS each.

BTW, the db804DVC's are...

I have a custom sealed subwoofer enclosure made of 3/4" MDF with a Vb of 0.82 cu.ft. with a max. top mounting depth of 4.5" that I need to add subwoofer(s) to.
My choices for subwoofers are:

...

Ditto what MacLeod said!

Option 1:
You pick up an "all in one" powered bass enclosure, since most will have level speaker inputs.
Many manufacturers offer these, below are a few that offer...

Are you deadset on getting the discontinued JL Audio amp?

If not Sonic Electronix has the Power Acoustik LFA4-1200 for $114.99.

The LFA4-1200 gives you a bit more power, 125w vs. 110w (JL's)...

Are you building your own enclosure again?

If so, below is a link that you might find useful:

http://www.ajdesigner.com/fl_subwoofer/subwoofer.php

Depending on what year Wrangler you have the following sub enclosure might work for you. You do need some basic skills and the willingness to modifiy your rear seat but you end up with a stealth sub...

I am in the process of upgrading the sound system in my '05 Jeep Wrangler Unilimited!

Are you committed to buying from Crutchfield and getting the Profile amplifier?
If not Sonics Electronix has...