The Xbox 360 is the second console to be developed and produced by Microsoft, It is the sucessor of "The Original" Xbox but also the predecessor of The Xbox One. The Xbox 360 has many versions or types:
Xbox 360 Arcade (October 2007) Discontinued
The Xbox 360 Arcade is the cheapest and entry level model of the 360's. The Arcade oftenn comes as a bundle package with: The Console, One wireless controller, compostie A/V cables and some games (Depends on retailer).
The Xbox 360 Arcade only comes with 256MB of storage, as an external hard drive does not come with it, also the disc tray is not silver coated.
This console is priced at around £60 / $100. Hard drives can be purchased from retailers or the Microsoft Store Online. Also, USB Flash Drives can be used as a save device for your profile and save game files.
Xbox 360 Premium (November 2005) Discontinued
The Xbox 360 Premium (also known as, Xbox 360 Pro) is the standard console and was more popular when first released back in November 2005. The console come with a 60GB external hard drive, that is already conneted.
The console is priced at £80 / $130. A bigger hard drive can be purchased from retailers or the Microsoft Store Online. Also, USB Flash Drives can be used as a save device for your profile and save game files.
Xbox 360 Elite (April 2007) Discontinued
The Xbox 360 Elite was the more upper classed model and came with a 120GB external hardrive, already conncted and was released in April 2007.
The console is priced at £100 / $160. A 250GB and a 320GB hard drive can be purchased for the older 360's but that is the biggest they go, and do cost a resonable ammount. Hard drives can be easily replaced and content can be transfered using a Official Transfer Cable. As always, USB Flash Drives can be used as a save device for your profile, as can Xbox Memory cards. ==== ====
Xbox 360 S (June 2010)
The Xbox 360 S (also known as Xbox 360 Slim) was released in June 2010 at a price of £185 / $300. This price still stand in October 2013. The S is smaller, quiter and faster than the older versions of the 360.
Xbox 360 E (June 2013)
Xbox 360 E was released in June 2013. The console was designed to have a similar look to the upcoming Xbox One, the console is apparently, whisper quiet and the fastest Xbox 360 there has ever been.
The console was announced at the same time as the Xbox One reveal. The release price was $200 for 4GB and $300 for 250GB.