The neoPDP range have issues with floating blacks, increasing black level due to voltage increases as well as buzzing. The standout TV's this year for me are the Sony Bravia EX503, LG LD690 and the Sharp LE700.
Yes the EX5xx LCD's are great sets this year, people with a pre-disposition against LCD's should take a look. I did and was very impressed.
No motion problems that i have spotted, very good black levels (that won't change over time
*cough* Plasma) and no buzzing.
I know some people complain about buzzing on LCD screens, but if you read the forums a lot more people complain about buzzing on plasmas.