Pretty much anything under the label of 'hardwood' is what you'd likely want. Honestly you don't even need that for something like a media rack, but if you're willing to pay for some nice wood, it can really add something special to the space it occupies. As for which one you'd want, that's entirely up to you. Maple and Cherry and lighter colored, ebony and walnut are darker, and there are plenty of everything in between. There are also plenty of interesting grain patterns that you can look over that can really make a piece pop. Burled wood like this doesn't have a uniform grain, but instead looks like the wood has waves or bubbles running through it and depending on the piece can look absolutely amazing.