Question: Why not just play the DVDs from the PC?
Anyway, the product choice depends on the monitor it's going to partner with. Is this a monitor that has internal speakers and can take sound via HDMI? Or do you need to connect an audio out to some external sound system?
Also, how does the monitor cope with a 50Hz signal that it'll get from PAL DVDs or a 59.94Hz signal for NTSC-based DVDs. Neither of these are a standard 60Hz signal that is generally the lowest refresh rate you'd get from a typical PC graphics card.