Kevin wants to get his wife a nice DSLR, but he's confused by the sensor sizes. Should he get CMOS or CCD? Leo says that all DSLRs have CMOS sensors now, and they come in various sizes; usually APS-C, full frame, or micro four-thirds sensors. The bigger the sensor, the more light it can take in. Naturally, full frame is more expensive and tends to be in professional grade cameras. But that doesn't mean that APS-C isn't good. It's great, especially for the hobbyist. Having more megapixels is also a good thing, but only to a point.
DSLRs typically use mirrors to reflect the image into the viewfinder, but that adds size and weight. The new thing is a Mirrorless DSLR.
Micro Four-Thirds is a great option with nice lenses. Leo likes the Olympus OM-D E-M5. In the APS-C category, Leo usually recommends the Canon Rebels. What about the Sony A7? Leo says that they're great cameras, but may be a bit advanced.
Chris Marquardt likes the Canon SL-1. It's compact like an MFT, but uses Canon lenses. He also says that Micro Four-thirds is a good place to start.