Input lag is a horrible metric because there's no standard for it, each manufacturer has their own and they often don't tell you what it is. I have a 30 inch Dell IPS panel and I wouldn't trade it in for anything.
As a side note, in order to use a 10 bit color depth you will need to have a professional graphics card such as an AMD FirePro or NVidia Quadro. You will also have to turn off desktop composition effects.
Most TN LCD/LED panels interpolate 8 bit color channels down to 6 bits for technical reasons. Good IPS panels use the full 8 bits at all times so even without a 10 bit source, the color will still be much deeper and richer.