Apple's new iMacs are available for purchase in US and UK Apple online stores. Both the 21.5" and 27" versions are available and both versions will be shipped on December. The new iMac had done some changes to its design and now it is slimmer and has more performance than its predecessors. It comes with 3rd Gen i5 and i7 processors and the LED-backlit wide screen display promises a 75 percent less reflection and it also come with the IPS technology. New iMacs are also packed with better graphic cards that range from Nvidia GT 640M to Nvidia GTX 680MX s.
They have also given the option of selecting a 3TB hard drive for your iMac (only up-to 1.5 TB was given previously.) or you could have a faster 768GB flash memory , which is exclusive for 27" version. They are also introducing FusionDrive technology, which is very similar to the Smart Response Technology (SSD caching) that we see on PCs. It also has 2 Thunderbolt ports and 4 USB 3.0 ports. New iMacs come with Apple OS X Mountain Lion and the link on the title will direct you to the Apple US store.