BAH - i just typed this and lost it, cuz i was stupid
SHEEESH!
anyway, here goes:
in ANY install, i definately recommend a subwoofer. most components sets can only accurately reproduce sound down to around 50 hertz. you DEFINATELY need to fill the gap between 50 and 20 hertz. if you're looking for bang-for-the-buck woofers, check the Image Dynamics IDQ and the Adire Audio Shiva. both work in a relatively small enclosure and will sound great for you.
rear fill - don't waste your time or money. ask yourself: when was the last time you went to a concert and stood with your back to the band??? adding rear fill to a system will only add phasing issues.
i'd also always recommend sound deadening for any install. generall, dynamat is WAAAAY overpriced for what its worth. brown bread is a VERy good alternative. also check out my webpage i made about sound deadening
here.
there is nothing wrong with buying speakers from ebay. i've done it, and i've been running these speakers for 3-4 years now. when installed correctly nothing should fail.
always, ALWAYS buy the best you can afford. you get what you pay for.
from what i've read, the tweeters on the MB's tend to get rather harsh. i'd definatly recommend the JL XR series. they sound awesome and you can get them for around $280 online. if they're in your budget the new adire audio Kodas *should* be an awesome set of components, but the will be around the $400 range.
as was said, by another, don't skimp on power. again, get the best you can afford. the JBl amps are great for cheap. if you're into REALLy exotic, brax, mcintosh etc. cadence, autotek, JL are awesome too (can't beat the flexibility of the JL amps).
anywayz, i've rambled FOREVER now. hope its been of some help.
BTW - sweet car
later,
nathan