yeah i just got the t10 legs late last night, and haven't been able to get rid of the expertise yet, i just got a battered hilt drop for me thought, so it shouldn't be a problem. I spread sheeted all the gems and its telling me i should be pulling about 10100k dps when i finish geming, whitch sounds reasonable, i was pulling about 9k in a 25 voa yesterday.
On saurfang in 25 man I do roughly 11k dps, and more around 9 or so on 10 man, so I could see you getting to 10k with 25 man buffs if you're doing close to 7.5k, especially if you change your gems around and level engineering up to where you can use the enchants.