Rack Advice Needed

I am interested in a rack that will fit into an existing opening in my living room where I now have a bookcase. Something sturdy, about 4 feet high, that slides out preferably. I now have an amp, pre/pro, universal disc player, video processor/switcher, cable box, media center pc and will be adding a DAC and power conditioner soon. I am planning to have an enclosure built around it with doors that blend into the room, and bookshelves above it. Should I plan to have a fan built in as well? Any suggestions of where to look or order from, brands, materials, features to watch for would be appreciated as I am a newb and this is my first "real" system. Thanks.