You probably don't want me to answer this for you, But I will, because I fit the minimum requirements for your standards. :]
DK's Backair, Priority, And his 'newly' found ability to super-armor his way through falco's lasers has made him a viable character. Not to mention the fact that it is indeed that of a 'bad' match-up for marth, a comment character in todays metagame. DK can effectively camp you with his punches (lol iknorite?) and to put it simply, '*****es don't know about his back air.'
Pit.
Camp.
End.
Really, Pit played to perfection is one that camps and baits, and if you do that perfectly, you should be actually getting somewhere. Take Zex for example, third best in Nor-cal. To win tournaments, often times he switches to pit, and camps for the entire match. He lands the win, safely and securely, because not many characters have answers to that kind of spam. And as long as your defensive game is on key, you shouldn't have a problem with close combat with pit either.
At least Peach went up, right? x]