Looking to buy an xbox 360 and want to know the difference between the three?

Here is a small guide and info about all three consoles (arcade , pro and elite)

The Xbox 360 is available in three standard variants; the "Xbox 360 Arcade", the "Xbox 360 Pro", and the "Xbox 360 Elite". To save using the old original names the "Xbox 360 Core", was replaced by the "Xbox 360 Arcade" in October 2007. The 60 GB version of the Xbox 360 Pro was released on August 2008 in replace of the 20 GB version

The Xbox 360 Arcade is an entry level Xbox 360. The "Core" is no longer produced, having been replaced by the Xbox 360 Arcade. The Arcade system comes bundled with composite video cables, capable of only SDTV resolutions, but newer models with lot number 0728 or greater have an HDMI 1.2 output. The arcade may output HD signals up to 1080p when connected to separately bought HDMI, Component, or VGA cables. It may also utilize a separately bought 20, 60 or 120 GB hard drive. It includes a wireless controller, composite AV cable, HDMI 1.2 output, an internal 256 MB memory chip (units released prior 2008 included a 256 MB memory unit), and 5 Xbox Live Arcade titles

The Xbox 360 Pro (sometimes referred to as Premium and packaged as simply Xbox 360) includes all the features of the Xbox 360 Arcade and includes a hybrid composite and component cable with optional optical out instead of a composite cable. This model also includes a detachable 60 GB Hard Disk Drive (previously a 20 GB HDD) to store downloaded content, provide compatibility with original Xbox games, and store game data. The included hard drive comes with game demos, video clips and a free Live Arcade game, Hexic HD. In July 2007, this version of the Xbox 360 began appearing with the Zephyr motherboard (the motherboard used in the Elite) which features HDMI 1.2 output and an improved GPU heatsink. Although this package does include an HDMI 1.2 output, it does not come with HDMI 1.2 cables. Starting at the end of September 2007, the newest systems were shipped with the new "Falcon" motherboard. This motherboard includes the new 65-nm CPUs, making them quieter and cooler than the older systems.

The Xbox 360 Elite is the most expensive variation of the console. It includes a 120 GB hard drive and a matte black finish. The Elite retail package also includes an HDMI 1.2 cable and a controller and headset that match the system's black finish. Early Elite models shipped using the Zephyr motherboard, though newer models now use the Falcon 65 nm chipset instead. These Elites (and other Xbox 360 models using the Falcon) can be identified from earlier versions by a re-designed power connector and a power supply that runs at 175w. The motherboard layout is also different