I might suck, but I'll take a crack anyway though. ;o
Basically, I feel the HP should be moderate, but with enough to take advantage of its typing. Every fully evolved Ghost type, barring Giratina and Drifblim, have HP stats in between 45-70. Dusknoir being the lowest and Froslass the highest.
Now, as per a rule, and mostly due to the properties of being a ghost pokemon, they have subpar defenses. Dusknoir and Spiritomb break this rule, but their reduced HP helps to balance things out a bit.
So, since we aimed for our guy to be physically strong with bulky defenses, I feel we can compromise a bit with our HP and defenses.
As for speed, due to the nature of our pokemon, medium speed would work best due to him being more physically oriented. Think about it, aren't bulkier fighters a bit slower than lighter ones? A good comparison would be comparing Medieval Knights to Ninjas. The knights have the better defenses and raw power, but the ninja excels at stealth and speed while sacrificing armor, thus making him more vulnerable.
In terms of speed, Ghost types and fighters can be seem at mixed spectrums. The lowest of the Ghost and Fighting types would be Spiritomb with his amazing 35 speed stat. The fastest of these particular types is Infernape with his 108 base speed. We can easily compare the two as the Knight and Ninja. Infernape has amazing speed and power to cover up his weak defenses, much like how a ninja has to be quick and overtake foes before they have a chance to retaliate or else his lack of defenses will be his own undoing.
Spiritomb on the other hand is more heavily built and can take the hits, but this also nerfs his speed by quite alot, as would a suit of armor. However, the armor allows for the fighter to stay longer to deal more blows to his opponent.
Given that our guy will most likely be a bulkier physical creation, a bit of a cutback in speed might not be too much to ask. He'll have the appropriate staying power with his defenses to be able to fight valiantly.
With those points made, this is a beta spread I humbly propose:
HP: 65
Atk: 120
Def: 110
SpAtk: 80
SDef: 85
Speed: 65
Total: 525
Hopefully you'll find everything balanced out well enough?
Also, going back to my recovery thing. Since I believe his HP might be high enough to evade the need for Pain Split, Drain Punch might be a viable option for HP recovery, even if it might just be a gimic.