I'll say again, you'd be foolish to compromise low end where it counts for a secondary that doesnt care. Audiophiles don't buy "crappy speakers" people who don't care do. Why compromise the guy who wants to hear that "knock"'s experience so a guy who can care less hears a little more "pap" out of his laptop?
That's like saying "I wanna look my best for all the fine women at the club tonight, but I wanna make sure to look a lil' shytty so all the lesbians are confident in their decision to not be interested in me". Why consider an outlet that doesn't respect you enough to pay your work any attention?
There's a fine line between mixing for an NS-10/bookshelf audience(NS-10s are what? like $700 a pair?) and mixing for folk who are listening thru a frikkin phone! There's alot more environments to consider. Most ringtones are like 96kbps mono mp3s why do you need your mix to 'compete" in that league? Shouldn't you be referencing cars, clubs, homestereos, even ipod earbuds before a frikkin' phone?
You get your mix to sound amazing in these other environments and I'll bet you'll never hear one complaint about how they sound thru a phone or laptop speakers.