iMac: Get a refurbished 2011 iMac 21.5" Core i5. Options: Choose to get an iMac with 4GB RAM and 500 HDD, 8GB RAM and 500 HDD or 16GB RAM and 1TB HDD. Features: Bluetooth, Wi-Fi and four USB 2.0 ports. Processor: With a processor speed of 2.5 GHz. Operating system: Mac OS High Sierra operating system (released in 2017). Colour: In a sleek silver. Apple 21.5 Core I3 iMac Computer | 4GB | Living Social