Head Selections - Opinions + Help wanted.

I wanted to make a selection of Hasbro Customs at some point in the near future for my collection, so with that being said i wanted to gauge peoples opinions and thoughts on the best Head for each of the following characters, what i'm looking for here is what you think is the best accurate representation of the character, keep in mind this will be sculpted with a neck to fit a hasbro body 

Christian
Chris Benoit
Chris Jericho
Eddie Guerrero
Edge
HHH
Ken Shamrock
Kurt Angle
The Rock
Stone Cold Steve Austin

Obviously i already have plenty of customs to be working on right now (including classic managers) but at some stage i will be moving over to more recent characters too and it's always good to get some suggestions ahead of time so i know which heads + figures to look for.

Thanks for any advice offered.

RAW