> Well I'm going to hook this PC to my HDTV which is 120 hertz and see how things look > and run. If it look and plays 100% I will return this monitor and just buy another > HDTV and use the HLSL settings
BTW, 120 Hz TV's only accept video input at 60 Hz. They interpolate the video out to 120 Hz so it's not going to make a difference for MAME in the way that you think. To get true 120 Hz on an LCD/LED monitor you'll need to get a 120 Hz gaming monitor such as the Asus VG278HE or the Acer HN274H BMIIID.