I would also like to add that a truely great NT is above all else the hardest positional player to find. There is only one that comes to mind in the last ten years & that's Vince Wilfork. BJ Raji shows great promise but need's a couple more elite years to rack him.
Star Lotulelei is the top prospect in this years draft, best since Raji to fill a teams need @ nose tackle. 6-3 320 closer to Wilfork in style than ultra explosive Raji but many people feel could be a top 5 pick.
The best of the best just came out of High School & signed with the UCLA Bruins, Ellis McCarthy who is 6'4 5/8" listed 305 http://rivals.yahoo.com/ncaa/footbal...cCarthy-119941
While not in these players elite status draft grade please check out Mississippi State, Josh Boyd, all 6-3 300lbs of him, he fits Wade Phillips nose tackle requirements (has explosive game of Raji) just needs continue to work & improve feet & hands.