I'm using a 24" BenQ XL2420TX (emitter builit-in; price 500€) monitor connected to the DisplayPort of a Quadro FX 380 card. Works very well on 64bit ScientificLinux 6.4 with the kmod-nvidia driver from ElRepo.
Please also see http://strucbio.biologie.uni-konstanz.de/ccp4wiki/index.php/Stereo . HTH, Kay
