Only Sony and JVC sell sets based on the LCoS technology, although neither company calls it LCOS. Sony calls their version SXRD and JVC calls theirs HD-ILA.
I won't get into the technical differences between the technologies here, since they don't matter to most people. Go with the display within your price range that you feel has the best picture.
I'm a big fan of Sony's XBR models based on the SXRD technology. For flat panels, I prefer the Sharp Aquos line of LCDs. However, the new Sony XBR LCDs are quite impressive as well.