S60 is probably the best option for low input lag and semi-acceptable brightness. Last year's U50/U50 is also ok, although they're dimmer.
VT60 would be the second best as it also has low input lag but I do not know if you're going to like its ABL.
ZT60 would be the third best...same input lag as the VT, but dimmer.
Me..I will be waiting until the next year's models come out. Samsung F8500 turned out to be perfect, ST60 near perfect, but both are marred by terrible input lags.