If you're not running a sub going with the 6x9's will give you another 20Hz in extension not to mention will probably be more efficent. If looking for pure SQ though, there aren't really any "audiophile level" 6x9 sets.
But the Massive Audio and the CDT Audio ones "AAAAAAA" suggested both sound really great and if you want to get loud toss 300wRMS per side on them, they'll take it.