Well that's the other option if you don't want custom door builds or you wnt to keep it OE looking.
You can get some components and fit the big speakers in the door grills and the tweeters under the dash grills.
In the past I have had Sony 10cm speakers in the dash and they were pretty good but not amazing. I'll be getting these JBL's in the new year (Front and rear) so I can't comment on these ones just yet!
Nick