if he doesnt have subs would you even want tweets? At low level tweets always seem a tad over baring for me. Sub /\/\ I think your right as far as the components go. what kind of deck are you running? Most of the subs that you would want are 65-100 rms.
If no after market deck do these
http://www.sonicelectronix.com/item_44371_Clarion-SRG1622R.htmlPush in a few more bucks and you could have these
http://www.sonicelectronix.com/item_33003_MB-Quart-FX4.50.htmlhttp://www.sonicelectronix.com/item_9111_Polk-Audio-db651.htmlThe speakers for their size have pretty low end range 35 hz for a 6 1/2" is pretty damn good, and the tweets are not "tinny" sounding. I know Sepulturas Roots album sounds awsome on them
I ran that same Mb quart amp in my sisters car and never had a problem with it. I just installed it under the passenger seat. Power and remote run up the door side, Grounded to one of the seat bolt as they usually sturdy enough to hold a person down so there must be some metal. You may want better rca's to keep that engine whine out, maybe another 10-20 bucks. I took the lazy route wiring the speakers And just ran wiring back up to the deck and tied in there. ( I know, I know , but who has time to wire someone elses doors. Imo its a stupid place for speakers)