here's my view on your items:
Head: 245 Triumph badge helmet
Neck: Tank neck from Halls of reflection lich king escape end chest
Belt: What you have will do until you can afford the frost badge belt, which is worth every penny.
Boots: Black spire sabatons, Forge of souls heroic end boss
Ring: There's a tank ring in ToC5 heroic. It'll tide you over until you can get the ICC verdict ring.
Trinks: 245 triumph badge trink, and run ToC5 NORMAL until you get the black heart. get some dps'ers that are hunting abyssal rune and you'll get 5 runs done before tea.
Back: Frost badge cape. There is nothing better.
Weapon: Rimefang's claw, Pit of Saron Heroic end boss
Gems: Gem stamina everywhere, obviously using your JC-only cuts where appropriate. Only variation: put a purple in to activate meta, and gain a good socket bonus.
Notes: do not spend frosts on anything except the frost cloak, gloves, chest and belt. They are awesome upgrades and anythign else should wait. if you absolutely MUST have the trink, buy it and return it every 2 hours, thereby keeping the emblems.
Regarding hit: bust your hump getting armour and stamina, not hit and expertise. They are 'nice to have', not 'must have'.
Only pvp enough to get the pvp shoulder enchant, otherwise, just do it for fun/something to do.
Enchants: key ones are: blood draining for weapon. +275 health for chest. +armour for back. Tuskarr's for feet (some people prefer +stam only, but mobility on a tank is win). Bracer, ditch the +stats and get +stamina instead. Gloves you can go armsman or expertise. Helmet you want the argent crusade rep tank enchant. shoulders the hodir or pvp one, the pvp one is preferred.
Raids: obs10 and obs25 should be straightforward for you. You could probably offtank for ToC10 and 25, but make sure you know the fights, especially northrend beasts. ICC you could probably tank 4/12 minimum with a good team helping you out, especially with the buffs out at the moment.