6%? Dude this is the description of 5-7 on that link:
"6. Shredded = Striations appear in large muscle groups when they are flexed.
You look small in clothes, but look fantastic when you're not. Vascularity appears in lower abdomen and in the legs.
Condition can be held for several days with careful dieting.
Competitive bodybuilders often aim for this state for competition day"
Dude not trying to put you down or take away from your goals, yeah you would look absolutely sliced with a bf% that low but look at those points - BBers aim for it, meaning they dont gaurentee they will reach it, you look small in clothes (the way most people will see you) and most people can only hold it for several days?
Look at those pics on that link under 7-9% bf, those dudes are shredded and it would be much more achievable and maintainable IMO
but if you want 6% bf then I say go for it man it will be impressive as hell when you get there! Just dont want you to be dissapointed thats all or end up loosing alot of strength or muscle to get the last few percent off, but like I said if thats what you want then kill it!
personally I would be happy with a big thick looking 11-13%, hell that dude at 20% the first link on the page looks good to me because he is so big, maybe Im just biased about getting shredded cause Im a fatty lol
this is probably the leanest Iv ever been since I started lifting, about a year ago:
http://i40.tinypic.com/5fngue.jpg