Buying a 3D player really depends on a few things. First, if you don't have or aren't planning on buying a 3D capable TV, then it's kind of pointless. I'm not sold on 3D TV as of now. Also consider you would need glasses for each person watching. It comes down to weighing the cost vs. how much you would use the 3D capabilities. It does seem to be the direction things are heading though.
As far as HDMI syncing, I've noticed the newer model players seem to work better. If you're having problems, try a different HDMI cable. It can make a big difference. No need to spend a huge amount of money, but get one that's well made.
Most newer AVR's have a lipsynch setting so you can change the delay. Also, just because you have the ability to hook up more speakers, doesn't mean you have to.