It's a tough question to answer. You could say Stone Cold or Hulk Hogan for drawing ability. You could say HBK or Ric Flair for amazing matches. You could say the Undertaker for the major success of a gimmick and being a revolutionary "super-heavyweight." All of those guys are an easy top-10. But my vote goes to Bret Hart.
Brethas some of the best psychology/story telling the business has ever seen. If you want to know what I'm talking about watch his steel-cage match vs.Owen. Not only a 5-star match, but the storytelling is brilliant. And most of Bret's matches are great stories.
His matches are always different too. Not like John Cena doing the predictable shtick, but he could wrestle a different match three times in one night (KOTR 1993.Three great matches, three DIFFERENT matches.)
Bret has 2 "official" five star matches. However, Meltzer fails to include his match at Summerslam 1992, the Iron-Man match at WM12, his match vs.Owen at WM10, and countless others as "5-star matches."
Bret was able to be a great storyteller and one of the best technical wrestlers the business has ever seen. We'll see other Flairs, HBKs, Undertakers, and Hogans, but Bret is truly one of a kind.
As far as "old-school", it's Harley Race. The man,though not the most physically fit wrestler ever, could cut a pace in a match and make it entertaining. The seven-time world champion is considered by his peers a legit tough-guym andoneof the greatesy ever. In a time where repeat world champions were somewhat rare, he won it 7 times.
My top 10 of all time would be ("Wrestlemania" era):
1. Bret Hart
2. Ric Flair
3.Steve Austin
4. Hulk Hogan
5. The Undertaker
6. HBK
7. Randy Savage
8. Ricky Steamboat
9. The Rock
10. Chris Jericho