Marcher : Recovers mvs. Must have.
Glutton : Can't get full. Must have.
Slaver : Slave Giants (and other crap). Must have.
Lasher : Makes lash useful. Must take unless you think you can figure out how to use headbutt effectively (I haven't)
Backbreaker : More reliable spinebreaker + 1 extra tick of lag (I think). Very nice. Probably a must have.
After you have these 4-5, you can experiment, but I wouldn't play an orc without at least the first 3 (in that order) and probably the next two,
though I have never have made good use of warbanner, so maybe headbutt can be good.
Heavy Foot : Punt kills are stylish. Also helps with cheapshot and trample. Not very noticable.
Master of Bloodletting : + 1-2 drinks per exsanguinated skin. Awesome edge. Bullshit prereqs.
Flailing Fallback : Does an elbow/knee. I think if you hit a knee/elbow, you can't get a parting blow.
Undersight : Scan in the Underdark. Useful for hunting there and cheap.
Opportunistic Carnivore : Slightly better savage feeding, plus you won't get hungry much.
Will of the Slave : Move mvs from forced march, faster recovery. I think cheap and low level isn't bad.
Brutalizer of the Handicapped : Better offense against the blind. Expensive, but nice for cutting through defenses.
Slippery Coward : Skrugga edge, wiki is accurate AFAIK.
Survival Instinct : Give you a chance to do 2 last stand attacks per last stand. So possibly 20 strikes... a round.
Shield Eyes : Being blind isn't good for an orc's health.
Seasoned Traveler : Recovers mvs. Didn't take with Krunk, but then troll amulet is better than an edge.
Masochist's Endurance : + 1 Con to Shigru. Not sure if it does anything else. Was dissapointed.
Disease Carrier : Reduces str loss from disease to 0 and makes it so you can regen through disease. Also easy to
contract disease, so it's a double edged sword.