I use one of these. They make two different models, one for photographers, and one for designers. It’s the same unit, just different software.
I would get the photographer unit, even if I were a designer (I’m both). Why? Well because the only color critical work that a designer must be concerned about is pantone, and that can be dialed in manually, without worrying about what your monitor looks like.
But this issue is not nearly as important as it once was. Most printers are recalibrating themselves to sRGB color General North American CMYK colorsets. If you use a decent printing service, they should be able to provide you with their specific CMYK conversion profiles. Then you won’t have to worry about it. Just use your standard out of the box monitor color and go with it. But if you’re doing your own desktop printing, proofing to client, then you definitely want to invest in a decent calibration solution/workflow. WARNING!!! These things are great time stealers and can be very tedious… Takes about 45 minutes to calibrate one printer/monitor combo… I have six. Some shops do it twice a day. I do it once a week and see no changes.