Please do not ask for advice regarding your individual gear choices. You can find the answer to your questions through a combination of spreadsheets, SimC, and the forum search function.
About trinkets most useful, i have only Essence of Eternal, Heart of Rage, Apparatus and Dwyer'd Caber yet (none heroic). Dwyer'd proc every 50sec +-; Heart of Rage have a long time to proc(i guess) and Apparatus/Essence is usable trinket.
On this case which is the best combination?
Ps: forgive my english :p