You can consider these currently popular trends.
Full Length and Height
These are the full-fledged entertainment centers that often cover entire wall surfaces. They are elaborate, composite multipurpose entertainment hubs that do much more than their stated purpose. Full length and height entertainment centers are usually not standardized products.
Meant for the affluent and elite, they are designed to cater to individual tastes. They are designer furniture, involving the teamwork of an interior designer, architect, and craftsmen. If you want a full-fledged unit, it is better to take ideas from catalogs and then consult experts on how to create a bespoke entertainment center for you.
Low-rise
These are the cabinet-type entertainment centers that sit on the floor or are slightly raised on legs. The body is divided into neat symmetrical or asymmetrical drawers, shelves, and open decks. The TV, home theater assembly, and other entertainment gadgets sit on the top surface, accompanied by appropriate showpieces and art décor.
The TV could also be wall-mounted separately, above the entertainment center. This design has covered drawers and cabinets, hence it is maintenance-friendly. Being a conventional "closed-box" concept, it will be your type if you prefer established conventions with proven effectiveness.
High-low Combination
This is a mainstream entertainment center that you are sure to encounter in your design explorations. Among the many variations, the most standard configuration is a low-rise central piece with two towers on its sides. The TV could be placed on the top of the central piece or mounted on the recessed wall. The asymmetrical appeal of the design makes entertainment centers universally popular. You can consider it if you have other furniture of varying heights with which this new addition will blend.
Combination of Movable and Fixed Parts
These entertainment centers combine multiple units out of which some are movable or detachable. This feature offers great functional flexibility since you can move out or move in some units as and when needed. For example, the book cabinet fitted with castors can well be part of the entertainment center, but if you are in the mood to check out several books on a Sunday, you can move it to your study and swap books at will.
Illuminated
These are the self-lighted entertainment centers. The lighting could be fluorescent or incandescent, concealed or external, adding interest and a decorative feature to your living space. Some designs also incorporate opulent lampshades, mini chandeliers, or wall lights. If you want to choose this type, please see that the lighting does not distract or disturb your TV viewing experience.