I think we can break the power forward position down to 3 areas:
You have the stretch 4....player with 3 point range. Ryan Anderson/Channing Frye
You have a Face-up 4...player with ability to face up and hit 18-20 footers and drive the ball. Chris Bosh/PAul Milsap
you have Traditonal 4...plaer with mostly post-up game and high post jumper (15 feet). Pau Gasol, Elton Brand (pre Phily)
I think we get a many players that have a combination of 2 of the 3, so it is not easy to peg them as a traditional or stretch.
Detroit won in 04. Spurs won in 05. Heat won in 06. Spurs won 07. Celtics won 08. Lakers 09 & 10 seasons.
I used the year that the season started in and the info was pulled from the NBA website. The last couple I added myself, so they might be on a different time scale than the rest. But my point remains the same.