I prefer a Buck Vanguard Cabela's edition. S30V blade instead of the normal 420HC. I've gone through 3-4 deer with it without sharpening. Field dressing, skinning and quartering.
I tried a Havalon a year or two ago. Didn't really like it, didn't feel good in my hand, seemed too small. It's also a bit difficult to clean and the blade popped out when I was trying to cut up a squirrel.
I just used a Mora to field dress, skin and quarter a deer last week. Very sharp out of the box, but by the time I was halfway through quartering, it wasn't as sharp as I'd like. Aside from that, I really like it. The blade is a very good shape for coring the pelvis (if you don't split the bone), the sheath is very easy to clean since it's all plastic, and it's blaze orange so it's hard to lose it or the sheath in the leaves.
If I could get the Mora in S30V, that would be real nice.