MSP Audio upgrade ?

[ForceFed]

Well I have been thinking of upgrading the MSP's audio dept. and was wondering about a few Q's?
I would like to keep the factory enclosure and re-use it for room and weight saving purposes.
What is about the most efficient DVC 8'' sub that I could feasably put in the MSP's sub enclosure?
I will also be re-using the original sub amp location to put a new amp in to run the new sub.
Once again ,what amp to run for the most efficient power for the new sub?
I am also planning on addind a four channel for all of the other speakers .
What amp for these.
Keep in mind that I like to use excellent products FOR THE MONEY and like things to match when possibble.

Suggestions?
Matt:)

[mazdaspeedpower]

Sorry fot the thread jack Force Fed, but I was also considering upgrading my system. I was thinking about getting rid of the deck under the back, and selling it. My questions are:
1. Would I lose any of the car's structural Integrity, or anything a else.(pretty much, does it serve a purpose other than holdy a weak sub??)
2. How much could I potentially sell it for???
That's it, PM me with answers,(I'm not selling it....yet), don't take any more room from Force Fed, and now, help him!!!

[mazdaspeedpower]

Just read a jack load abou this in another thread, I think the best sub they were talking about, and I'm now considering is the JL 8w3v2d2. It's exactly what your looking for. Check out the other thread http://www.msprotege.com/vbb230/showthread.php?s=&threadid=42855