New speakers, or just add tweeters?

Ok, I have been having another debate with a friend about speakers.  Someone I know just put 2 Kicker Solo Baric L7's with a HiFonics 1600 watt Mono Amp in his car. Because of the intense bass, he cannot hear the words with his stock speakers.  He dosent really know ablot about speakers so I told him to replace all the interor speakers, 6x9's in the rear, and 4x6 in the doors, and connect a 4ch amp.  My other friend is just telling him to keep the speakers and add 4 tweeters, 2 in the front, and 2 in the rear.  Please let me know what you think, do you agree with me, or with my friend. By the way, money isnt a huge issue, he isnt looking to spend thousands of dollars on his interior speakers, just a couple hundred at max.  Thanks.

i would agree with new speakers and a 4 channel amp normally i would suggest componets but with those subs don't think hes really going for SQ  so some 4x6 and 6x9's from www.ikesound.com will do the trick1974 ford pinto 4 15" punch Z power punch bd 1001 pioneer DEH-6700

I met a guy a few weeks ago who showed me his stereo... he had 'componets' ... like .... seperates from Wal-Mart, with the midbasses mounted in the doors like normal right, then he installed the tweeters .... PARALLELED off the deck with the mids, behind the CENTER dash air vents in the middle of the dash. His sub was a little home stereo Bose Acousitmass he had wired to the rear outputs of his deck, which was wedged between the seats and was being used as an armrest."I'm finished!" - Daniel Plainview