I'm not sure if this will help, But I took the T7 25 man DPS gear along with what I though were good additions to the other slots along with enchants and Gems and came up with the total + to stats
Str= 805
Agi= 187
Hit Rating= 416 (I have no idea what the hit cap is with 2 handers always played a Rogue)
Haste Rating= 408
Crit Rating= 742
Attack Power= 720 (this is assuming 20 stacks from Fury of the Five Flights)
Add in the base stats of a race at lvl 80, which I don't know

, and you would have a decent basis to enter in on the calculator.
Also I gemmed for Socket Bonus in everything and used. Bold Cardinal Ruby for Red, Sovereign Dreadstone for Blue, and Smooth King's Amber for Yellow. I'm sure this could be improved upon greatly but just giving it my best shot maybe something to work with and plan out for materials and so on as you level up.
anyone know what spec the base Blood Deathknight on this calc is....I can't seem to match it no matter what I put in, The closest I can come is the 50/0/21 using Unholy Presence