One general gearing tip, especially for the 10 man raider. Is that Arms is all about ruthlessly cutting out the stats you don't want for the stats you do want. What I mean is you want to get rid of all your haste and just barely meet the hit cap and don't even care for expertise at all.
So... your first task is to fix those trinkets. Mirror of Truth is an immediate upgrade on the expertise trinket.
The next one will be harder, but DMC :G or Banner of Victory are better than the Mark of Supremacy. You can make up the hit by getting the http://www.wowhead.com/?item=47697 and matching a yellow socket or two, with the added upshot of dropping some haste.
Needle Encrusted Scorpion is the ideal trinket here, but it's not really grindable. If you have options, then Needle + DMC/Banner/Mirror is going to depend on your gear level, but generally DMC, Banner, Mirror is the order.
Go from there, any piece of gear that has haste on it... you want to replace. Sometimes that means even going down in iLvl (like with your trinkets) if it means getting a better stat balance.