Pet peeve of mine: Please don't mention your gear score. The people who are most likely to help you have higher gear scores.
To your question: You're at a point where you need to decide if you are going for 4pc T10-264 or off set. Based on your gloves and shoulders, I'm going to assume you are not shooting for 4pc T10. The badge chest is probably your biggest single upgrade. If you want tier gear, save up your badges and get the T10-264 legs and helm at the same time. The expertise on the T10 pants will offset the expertise lost on the T9 helm.
Yeah, I was going to get the 251 pants, I decided not to go for the shoulders as the ones currently equipped are from ICC25 Saurfang I think. Thanks for the response. So I sould save up 190 emblems and get the head and legs at the same time?
I don't remember what pants you use for tanking. Sorry, you're in half dps, half tank gear. Generally, the chest is the biggest upgrade for most players. The T10-251 helm isn't a huge upgrade for you, but the combination may be a good upgrade.
The pants will be a nice upgrade for you. They will also give you some flexibility to replace one of your expertise items with another purchase. The cloak or helm are natural fits for the next purchase after the legs.