2003 Honda Accord Sub appl.

Does anybody have a recomendation to add a sub to the existing factory system in accord sedan ex. I will use an aftermarket mono amp to power SUB(highlevel connection).  Not looking for a custom built Sub, but an already existing after market type thats proven to sound good on a budget? Thanks.

JL Audio, MTX, Kicker, the list goes on.  Do you want custom fit for the accord?  And what's a "budget" to you?  More info please. 

Something that can easily be removed. Would like to pay no more than 150.  SIngle 8, or 10 in small enclosure.

lol. i dont like the sounds of an easily removible system. thats just an invitiation for theives. anyhow, 150, does that include the amp sub and box, or just the sub and box? 1990 Honda Civic HB:

Clarion DXZ545MP H.U.

2- 6.5" Power Acoustik interiors

Diamond Audio 600.1 amp

Diamond Audio 15" M6MKII

Pyramid PB881X 4 CH. Amp

Just the box and speaker.  I'm wondering if ported or sealed would make a diffrence.  It could be ported through the Ski hatch armrest into the interior space. would like to use a dedicated mono Mtx amp approx. 250 watts into a dual voice coil speaker at 2 ohms or a duel 4 ohm driver config.  Keep in mind this car has to keep most trunk space free.  Anybody have a suggestion.