Our kitchen has been one of the sore spots in our decor since we first bought our house. After 2 years, we had to do something about it. While it would certainly make a big difference to replace the cupboards entirely (and I really pushed for it for a while), we both agreed that this would not be a very green thing to do since our cupboards are perfectly functional.
We finally agreed that a change of hardware would give us the update we needed. I think you'll agree based on the pictures that the handles on the cabinets were definitely keeping our kitchen locked in the 80s.
Hardware's not enough of a change for you? Consider refacing the cupboards instead of completely replacing them. It will save you thousands of dollars as well.