TrinketsFollow

I'm starting to have a fair amount of money and was thinking about buying a nice trinket at the AH for my rogue.

I was looking at the Darkmoon Card: Hurricane and Unheeded Warning.
Anyone has tried both and could tell me which one seems the most useful?
Right now I'm using Heroic Grace of Herald and Heroic Key to the Endless Chamber.

After a LOT of Lost City of Tolvir, I still don't have my Heroic Tia's Grace...

I'm also saving my Valor Points to buy Fluid Death...will probably have it in like 2 weeks lol

I could also buy Unsolvable riddle from the TB quartermaster but was wondering if it's worth it since its ability need to be used instead of just having a proc once in a while.
Also, would that stack with the agi bonus from Key to the Endless Chamber?

Thanks