Component vs 2 Way Speaker

Ok I will take your word for it. 

I appreciate all the info you have provided.  When you have a chance if you could shed some info on mid bass drivers I would appricate it.  Could they be used in the rear to provide some bass instead of putting in a sub?  So components in the front and mid bass drivers in the rear?

That would be a fine place for them. As long as you have room. If you want to put the crossovers and amp under the seat try to mount them as far back from the front of the seat as you can. This will keep people from kicking the amp or crossovers or getting them dirty.

For subs, you can get an idea of how they will perform based on manufacturer specifications.  But it is impossible when you are talking about components.  Higher frequency reproduction is MUCH more complex to where little things like dustcap design, cone materials, or even surround treatments can have a large effect on how the speakers will sound. 

You can use midbasses as subs, but keep in mind that they don't usually have the excursion or cone area larger subs have.  So you will probably not get the output or extention you would get out of a larger subwoofer.  If you are looking to go this direction, I would suggest looking for a driver specifically designed for this.  Here's a good one that might work: http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=264-832

Steven Kephart

Adire Audio

Can someone let me know what you think of this component set?

http://www.sonicelectrnix.com/item_2788.html

Well I think I have made my decision.  I am going to go with these Alpine SPR-17LS