For gfx, you need to get a scandoubler to get it shown on a LCD/Normal pc screen. You can use workbench with a monitor driver like productivity, wich will work on LCD but when you run a game, it will not display at all...
cdrom - standard ide, you proably need an 2,5 -> 3,5 Ide converter. Network card in pcmcia, not expensive.
And no you ownt experience usb2.0 speed, but its compatible with the 2.0 standard.
if its worth it ? If you like to play with computers, ofcourse it is!
Also recomended;
www.whdload.de 