Go for 2010 Panasonic models, they have better black levels (5,000,000:1 Native vs 2,000,000:1 Native) and new anti-glare filters. S1 is good, I have a G10 same panel, but not as good as new G25/G20 models. They don't come in very large sizes though.
I did not see that black increase level issue that is being discussed at AVS forums by the way.