Yeah, the Fel Leather gloves/legs/boots. If you can get the wastewalker 2 piece set(chest/shoulders) The 2pc is 35 hit rating. Icon of Unyielding Courage has 30 hit and 600 armor ignore use and also drops in H BF which is where the wastewalker chest drops anyways. I would replace your cross trinket with it. On a raid boss you really get very few kill shots to make it useful at all.
The heroics you have to run for the wastewalker stuff can be a pain but well worth it if you cannot get the shoulders/chest/trinket from kara. Slayer's Mark of the Redemption (SV quest reward) or Ravenclaw Band from Seth Halls are good upgrades to your Ring of Umbral Doom. Girdle of the Deathdealer drops in H BM if you can get in a group for it and is an upgrade to your pvp belt.
Those upgrades or kara drops should be plenty to get your hit ready for 25 man content and topping the meters or atleast putting up a good fight. For gems, I'd reccomend +hit for all yellows, +hit/agi for all reds, and agi/sta for those terrible dps blue spots. Your meta is the best, make sure to keep it active if you re-gem stuff.
BTW- most people are not this nice to type it all out, but I'm at work and have way too much time on my hands right now. Look up upgrades for yourself: www.shadowpanther.net Remember its not the end all list of what gear you should wear but it is a very good overview of what you should be looking for.