Start here:
(current and newer iMacs - tapered edge)
http://www.everymac.com/systems/apple/imac/imac-aluminum-tapered-edge-faq/
Would recommend these, significantly better, especially the GPU.
(Slightly Older iMac)
http://www.everymac.com/systems/apple/imac/imac-aluminum-faq/
These will be cheaper.
I would suggest that you get the machines with the faster GPUs, generally these will have 2GB of Video RAM. Avoid the older ones with only 512MB, they will be dog slow. The 27" iMac is at least able to take aftermarket RAM upgrades, which means you should be able to bump it up to 32GB of RAM.
Also, if possible look for machines with the fusion drive, these are hybrid SSD and Mechanical disk machines.
I have a 21", I regret not getting s fusion drive. OS X is worse than Windows with a mechanical disk. It beach balls constantly.
A 4-yr-old computer is never a good buy. Maybe try a mac mini of a more recent vintage. Assuming you have a monitor already.
A 4-yr-old Windows computer is never a good buy. Maybe try a mac mini of a more recent vintage. Assuming you have a monitor already.
If I were to buy a Mac desktop, it would be the Mac Mini... But that fits my use at least.
What will you be using it for? Design, movies, etc????
Wouldn't a laptop make more sense?Mostly coding. The biggest reason I want an iMac is portability around the house and the big screen. I've lost the study so will be working around the house including the patio. A Mac Mini with a 27-inch screen is not a bad idea but that's more moving parts.
Wouldn't a laptop make more sense?
Something else to note is that if you upgrade the hard drive in most of these iMacs since ±2009, you'll need to run fan control software. Reason being is that the stock hard drives have temperature sensors in them. If the Mac doesn't see these statistics (using an aftermarket drive), the fans go crazy.
I'm not sure if SSDs are affected.