I agree that it would be extemely foolish to not send the head to a machine shop to get renewed. You've gone to the trouble to get the head off, why not get it cleaned up, get the valves checked out, etc.?
At minimum, you have to replace the valve guides. You can only replace the guides with the head off. The valve seals can be repalced with the head on, but these should be replaced anyway.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".