Which health care field has the most bang for the bucks?

I'm looking into the health care field and there are so many directions to go. I have looked into nursing and there are great 2 year programs close by. I am just wondering which field will give the best return for the amount of time/money that is put into training. These fields can include medical assistant, dental assistant/hygienist, pharmacy technician, radiology tech....Basically, I'm looking into going to school for no more than 2 years and want the best outcome for the time and money I've invested into education. I know that location can be a huge factor, but any input from those in the field would be greatly appreciated.
--------------------
RN
Source