+800 Health -> +675 Health
NEW UNIQUE Passive: +15% Bonus Health
That way it is easier to get to the threshold if you are actively building to make use of it while also giving Warmog's more of a reason to be bought. I feel, despite all the nerfs to the Health on other items, Warmog's is still a dull purchase to make.
Also, of course Cinderhulk and Warmog's wouldn't stack.