i agree with lovin ortho but i would also add AOA and school reputation up there. if you do not go to a top tier school, getting into aoa should be a priority - but i'm not saying being a crazy psycho gunner is good either. just try your best, be respectful of others and good things will follow.
research, i guess, is important, if you knew all along that you wanted ortho. i, for one, didnt decide ortho till real late, managed to scrounge up some projects, have submissions but no pubs as of yet - i do get asked this on interviews about this and i tell them straight up that i didnt know i wanted ortho till i was a 4, and they pretty much have had no answer. in my mind research doesnt make one applicant better than the rest, but that's just my opinion and i know a lot of ppl out there will disagree with me on that, and that's cool too.