When asked how much a cabinet project will cost in the first meeting or two, I can respond, 'how much does a car cost?' The general answer is, it depends.
Just like a car, there are a multitude of options. And quality is relative. What is good cabinetry? It is up to you to decide whether you feel the value is there. How important is it to you? How much wear/tear is it going to get? What is its purpose? How fancy/detailed/complicated is the project? Do you want it to still look great 10 years from now? You staying in that house for 5 or more years and want to enjoy it?
If you just need basics, Ben's response is probably close, $250-500 per LF. For the lower end you will get a finish carpenter level cabinets, may or may not be finished, minimal design or creativity, may not include drawings (drawings go a long way to making sure you are getting what you've agreed to), they may not be insured (what happens if they do damage in your house during installation?)
The higher end, $500 or more per LF, you will probably get a big step up in all the categories above.
As a cabinetmaker, my prices per foot can range from $400 per foot to $800 (uppers, lowers, no counters). I figure that for basic cabinetry (still top quality materials) and then present a list of options (like the old days of buying a car) and let the customer decide what they want to include and what they want to spend. (Species of wood, type of finish, lighting, glass doors, specific details, moldings, etc)
As far as an hourly rate if you go 'time and materials'. If it is a finish carpenter perhaps building the cabinets on site, you'll probably be in the $50-80 per hour, but again, that is still probably lower end cabinetry, possibly lower end skill set? If the cabinet guy has a decent shop, is insured, likely better quality and more experience, you may be in the $80-120 per hour? This plus materials, which can vary wildly depending on your project.
Sorry I can't be more precise, but like the car analogy, there are so many options. Let me know if you have more questions. There are lots of guys who say they can build great cabinets, I am sure some can. But in 33 years, I have fixed too many projects from guys who said they could build great cabinets. You need to see their past work if the cabinetry is important to you.