This is a big bump from the dead, but I'll try to chime in since I had this issue as well.
My diagnosis, the face of my head/block was covered in oil and I was losing about 1.5 QT per 1000 mile. As any of you could have guessed, it could be the cam seals or the VVTI O-ring. I took the process of elimination route and changed out the VVTI O-ring since after reading around the forums, they tend to go bad/dry up after about 150K+ miles or so... Plus, it was the easier job since it's right there in your face. I went in, cleaned up the area as well as I could, took apart the VVTI cam cover, and noticed a lot of oil behind it (this is normal to have oil here since oil flows through it, however mine seemed to have a little more oil than expected). Cleaned it up, replaced the O-ring, put everything back together, but left the top plastic cam cover off to inspect it from time to time. So far I'm about 1500 miles in and I have NOT loss a drop of oil. I'll continue to monitor it until my next oil change/drain and see how much oil comes out at that point.
@themob, I would recommend doing the easier job first and just monitor the leakage. If you still have a leak coming from around that area, then it'll most likely be the cam seal(s).
In OP's case, which I'm sure he's probably already resolved over a year now, I would guess it's the VVTI O-ring since he just had the cam seals replaced at the dealership. They should be competent enough to get the job done correctly without it any issues.