I hunt well enough with the dogs I have, mainly bull/ grey X, I am led to believe that the best cross for the deer's in mind is the Deerhound/Greyhound to a straight bull, these half breds have the best package with plenty of height,weight, guts, speed and brains.
But these dogs are not for the novice dog owner.
I have thought about using Irish Wolf hound and when I made enquiries I was met with the view that they would be too slow.
Very interesting subject though!