From http://forums-en.wow-europe.com/thread.aspx?fn=wow-tradeskills-en&t=40545&p=1&tmp=1#post40545
Artisan Blacksmithing Path:
At 225 make Steel Plate Helms until it turns green at 235. Then make Mithril Spurs to 250 (turns green at 255). At 250 make Dense Sharpening Stones until they turn grey at 260. The Heavy Mithril and Ornate Mithril armour items are good for their level, so you can also skill up some on making the mithril items for the Mithril Order quests. The Ornate Mithril Boots are popular with warriors for their remove root effect and they (and the Ornate Mithril Helm) turn green at 265. Go back to Mithril Spurs (which are readily saleable) until they turn grey at 275 and then make Thorium Bracers to 280. Now make Thorium Helms to 300. An alternative is the Imperial Plate armour set, starting with the Imperial Plate Belt and Shoulders at 265, Bracers at 270, and then Helm and Boots at 295. While these use more thorium than the Thorium armour items, they can be sold for a profit even if you buy the materials.
Specialty Path:
As an Armorsmith or Weaponsmith you can skill up making the items for your specialty Quest. Be sure to make them as soon as you learn them, and save the items to turn in for the quest, so you get your skillups. An Armorsmith can then skill up with Truesilver Gauntlets until they turn green at 245 (or grey at 265) and Truesilver Breastplate until it turns green at 265 (or grey at 285). Those are both saleable items. A Weaponsmith can gain skillups with the Shatterer, Phantom Blade, Blight and Truesilver Champion, as these are also saleable.