Solid State Drive for small commercial print shop I do graphic designing, prepress &amp; most of the file management at a small (2 owners – 5 employees) print shop. Although its not a huge operation, we're very busy and the iMac that I work on has taken a decent beating over the past few years, and definitely needs an upgrade because the performance of the HDD thats currently being used can be pretty bad at inconveniently random times. I use an SSD with my MacBook at home, and the performance between the two is always noticeable, so we're looking to get a SSD running on the iMac.

My question is, since we will have a lot of file reading/writing, and are constantly running relatively big applications like MS Office and the Adobe Suite, even though I'm intending on setting up a separate external drive for file storage, does anyone have experience with what SSDs perform best both in terms of longevity and speed in a commercial printing environment such as what I mentioned, and which perform best for Macs? We're also trying to keep the cost below $400 or so.
I would suggest a Samsung 850 PRO. Great longevity, warranty and performance. Or, if you want a bigger drive, get the 850 EVO. Not so durable, but we're still talking of decades. 

The Pro is rated for more writes than the Evo but costs more and has slightly higher benchmark performance. On an older iMac it’s not clear you’d benefit from the faster or more durable option.

Basically: 1000 write cycles per cell for the EVO and 3000 for the PRO. If you write 10GB/day (which is quite a lot) on a 256GB EVO, the disk will die in about 70 years, when you'll have written 256x1000 GB of data.