Didn't see anything like this around here, so I though I'd put up a list of the best enchants available for the BoA heirloom items. Note that these may be quite expensive, as most of them require pre-BC reputation.
Any Shoulders: Greater Inscription of the Gladiator - Item - World of Warcraft - yes, there have been many threads about it, and up to this point, it still works.
Balanced Heartseeker - Item - World of Warcraft :An obvious choice for rogues, and as such the best option available to enchant this weapon is Formula: Enchant Weapon - Agility - Item - World of Warcraft . This recipe is available from Timbermaw at Honored reputation.
Bloodied Arcanite Reaper - Item - World of Warcraft : This item has carnage written all over it. You can either go with Formula: Enchant Weapon - Crusader - Item - World of Warcraft if you want massive procs or with Formula: Enchant 2H Weapon - Agility - Item - World of Warcraft , a whopping constant 25 Agility buff. The Crusader recipe can only be obtained through drops, while the Agility one is available from Timbermaw at Friendly reputation.
Devout Aurastone Hammer - Item - World of Warcraft as well as Dignified Headmaster's Charge - Item - World of Warcraft : Formula: Enchant Weapon - Spell Power - Item - World of Warcraft is the obvious choice, with Formula: Enchant Weapon - Healing Power - Item - World of Warcraft giving 1 point less - regardless, both are zone drops from Molten Core. Also, there is the option of getting Formula: Enchant Weapon - Mighty Intellect - Item - World of Warcraft , available at Revered reputation with Thorium Brotherhood.
And finally, Venerable Dal'Rend's Sacred Charge - Item - World of Warcraft : You can either go with Formula: Enchant Weapon - Agility - Item - World of Warcraft, available from Timbermaw at Honored reputation, or Formula: Enchant Weapon - Strength - Item - World of Warcraft , available at Friendly reputation with Thorium Brotherhood.
The Thorium Brotherhood reputation enchants can be bought from Lokhtos Darkbargainer, the vendor in Blackrock Depths, while the Timbermaw reputation formulas are available from Meilosh, in the passage connecting Felwood, Winterspring and Moonglade.