Awakened classes vs old/new skills

I heard about some new awakened skills are worse than the old ones and better keep them(for example healers Light Armor Mastery).

I can't find accurate info about which skills u keep and which are replaced by the new ones. So if anyone knows little secrets like the example above or some good website which have accurate info post it here!

I didn't learn new PR on EE, cos I would loose old PR and return (new one just costs a bit less)
Empowering echo and arcane on SH.
Also if you dont learn wizzard harmony on enchanter you can keep warding song (in one of the rythms, I guess it only works for sws and bd). This is probably best for melee/archer groups, debatable for mages (we had it like this).

Some more info here:
http://boards.rochand.com/viewtopic.php?f=11&t=574