"...there isn't a single one 8-bit LCD laptop available in US right now..."

Yes, there is. The HP Elitebook 8730W can be ordered with the a DreamColor 8-bit IPS (or PVA not sure...) LCD panel. And Lenovo used to ship the T-series line with IPS panels. I think the W700 can also be ordered with a IPS WUXGA panel.