Hello, I am strongly considering purchasing an iMac 27 inch but have a few questions first.
1. Will there be a refresh soon?
2. Which model? (Is the base model powerful enough for basic task such as office, internet, and video playback)
3. Is the fusion drive quiet?
Thanks
1: Only Apple know this, sorry.
2: The base model, for the uses you mentioned will be powerful enough.
3: I have the Fusion Drive in my Late 2012 iMac. The Fusion Drive is basically a SSD/Flash Drive and a standard hard drive, the OS gets to learn what Applications you use the most and shifts them on to the Fusion Drive to make loading times faster, this is a basic description of what a Fusion Drive does. A Fusion Drive will be no quieter than a standard iMac that just has a spinning hard drive for its sole means of storage.
Coming from a Windows PC to an iMac, the noise reduction was very noticeable, I find my iMac to be very quiet. The current model iMac's and also from the Late 2012 model, they only have one cooling fan, so are quiet. I use my iMac in a quiet bedroom and when sitting a few feet away from it at the normal distance you would be typing on the keyboard from, you do struggle to hear it. Obviously, if you are wanting the quietest iMac you can get, a SSD/Flash Drive model would be quieter, as the only noise coming from it would be the cooling fan (i.e. there would be no spinning hard drive to add to the fan noise). But SSD/Flash Drive models are considerable more expensive but at the same time provide a more quieter iMac and one that loads up applications, saving data, much more quickly than either a Fusion Drive iMac or a standard hard drive model.
Hope this helps

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Thanks for the replies everyone! I ended up getting as follows:
4Ghz i7
500gb SSD
8gb Ram (User upgradeable)
m395X
Last question does this take DDR4 ram or only DDR3? thanks everyone!
Nice choice
Next iMac I get (in maybe 2-3 years time) I'm going to go with a full SSD one.