Armoury's working for me, now, too, so I'll add a bit in as well. First off, enchants:
-Head: should be the tanking one from KoT (Revered)
-Gloves: Strength enchants, currently, are almost useless to a tank. Either get the armour kit for more HP, or the 2% threat (my recommendation, as it scales extremely well and it means that your DPS don't have to lay off as much)
-Chest: +6 stats isn't all that bad, and he can keep that, but I would rate +150 HP as better
-Bracers: Same thing with the stats, but stam is better.
Gems:
Generally speaking, a prot warrior should default to +12 stam gems. The exceptions to this are if you need to to replace a few gems to make sure you have 490 defence, or you need another kind of gem for a meta (such as the +defence/+10% block value meta that'll come with 2.4... want...).
It is okay to try and get the socket bonus, but only if it is worth it. For instance... his boots,belt, gloves, bracers, shoulders, helm, and his chest to a lesser extent are all bonus not worth gemming for as a tank.
Generally speaking, with socket bonuses you don't want to be giving up too much stam (ie, only 3-6 for a socket bonus), and the bonus has to be good for the trade off.
An example of this would be the khorium destroyer (+27 stam, yellow socket, socket bonus of +3 stam). The trick with that one is that the socket bonus isn't actually stam, but rather the second stat on the gem that you'll use. You can toss in, for example, a +4 defence rating/+6 stam gem. This gets you +9 stam and +4 defence rating. Or if you need to get more threat, the +8hit rating gem works as well.