Totally possible, pretty much any crt monitor sold in the last decade is "high def" and they do sell plenty of very nice looking high def crt's....go to any good eletronics store and just ask for one....should be pretty easy to find in stock as they don't get pushed, i grabbed one last summer for about 300 bucks (widescreen, 1080i/720p) and it pretty much rocks....weighs 160 pounds though so be ready for that
edit: forgot to mention that a huge perk of one of these is that they can display non-native resolutions and not take the huge quality hit that lcd's and whatnot will