While furniture is not technically part of the room itself, furniture (the home entertainment center, to be specific) is usually bought with the expectation that it will be used for many, many years. When it comes to home theaters furniture is not often moved or replaced due to the labor involved in removing all of the electronics and then placing them back into or onto the furniture when the move is complete. Buying the right furniture is therefore important.
There are a few things that one needs to look for when buying a home entertainment center. First, and perhaps most important, is the configuration of the shelves and other storage. While it is a good idea to measure the current electronics in the home theater and make sure they will fit, it is equally important to view the shelving in light of what can be stored in absolute terms. For example, if the Blu-Ray player currently in a home theater is an extremely slim model it is not a good idea to buy a home entertainment center that has little room between the shelves. Try to avoid home entertainment centers which surround the HDTV as this will limit the size of HDTV which fits inside. It may seem a good idea now, but the decision will be regretted if a larger or thicker HDTV becomes affordable.
Also look for home entertainment centers with doors which close over the shelves. Today's electronics have many small lights and lamps which blink or stay on during operation. This plethora of lights looks interesting and expensive, but it also distracts from what is important - the image on the HDTV and the sound coming from the speakers. Doors obstruct this light. They will also usually obstruct remotes, but this can be solved with a universal remote and a good receiver.