Cashier ($5.35/hour) - worked there for the summer after my sophmore year in HS, minimum wage. Was the worst job ever.
Grounds Crew @ local country club ($7.50/hour) - worked here for 2 years summer in rest of HS and into college
Undergraduate Research Asst ($12.10/hour) - worked here for 3 years until I graduated college
Graduate Research Asst ($21.50/hour) - worked here for a year until I decided to take a full time job instead
Research Engineer w/ university (~$35/hour) - amazing job, but salary was a little low for me
Contracting with a small defense contractor, 5 people ($110/hour) - stressfull, no benefits, probably wont stick around for more than a couple years.
I am planning on going back to my research job in a couple years, to take a project management job, which should increase my original salary a good bit.
Happiness != money, but there is definitely a trend. At some point you have to sacrifice a little bit of money to get the job you love and plan to do the rest of your life. I could never work the job I have now for more than a couple years.. its way too stressfull.