A:AnswerTo date, I have not detected ANY input lag when hooked to my PC (which is more sensitive to lag than a console), using a keyboard, mouse, wired logitech controller or wireless 360 controller.
A:AnswerContrast ratios really don't matter as there is no standardization across the display manufacturers on how to measure it. So really, pick what looks good to you, not just what has the highest numbers.
A:AnswerLooks like it is back in stock now. I don't believe it is a product they have in-store though. I bought this monitor from BestBuy.com almost 2 years ago and have enjoyed it since.