I choose resolution SOLELY on refresh rates. I am extremely sensitive to refresh rates, and when I play first person shooters competitively I want at least 100hz, not only for comfort but for fps, the refresh rate caps the fps, and high (if possible, max) fps is important in first person shooters. I can easily tell the difference between 85 and 100, and anything less than 85 is untolerable. On my Dell P991 I use 1024x768 because it is the highest resolution that will support 120hz. I have not been able to tell tell the difference between 120hz and 100hz, but a few months ago I was not able to tell the diference between 100hz and 85hz. Once you get used to high refresh rates, it is very hard to go back.
I guess this is all null on LCDs, but I heard response time (ms) do limit fps. I don't know because I've never owned one.