LCDs dont refresh in the same way as a CRT, so you can run an LCD at 60Hz and it will be just fine. Thats what I run mine at. You don't want to run a CRT at 60 Hz though.
Run the LCD at whatever...CRT should be used withthe highest hardare allowed refresh rate for your monitor to prevent eye strain and headaches. Never run a CRT monitor a 60 HZ!!!