While nearly ubiquitous on single-DIN stereos, most stereos that feature a large LCD screen do not have a detachable face. These screens are most common on double-DIN stereo so make sure to take note of that if you live in a high-crime area.
Connectivity options are great features to look into when purchasing a new stereo. One common option is 3.5mm (headphone jack-sized) auxiliary input. Some types of connectivity that are found on newer units are USB inputs for connecting an iPod or iPhone and an SD card slot.
Double-DIN units offer unique features such as navigation and DVD playback with full touchscreen displays.
Most of the information in the roundup was gathered from www.crutchfield.com. The website offers some of the best values on vehicle audio equipment and has plenty of resources available for the best stereo for your needs. As an added benefit, their customer support is among the best in the industry.