mac102004

I'm looking at the Garmin Nuvi GPS units. I want to use one to load my Geocaches into, and have it give me turn by turn directions to the approximate location (on the road) where the cache is located. I have a Colorado 300 now that I will actually use to find the cache once parked. My question is, will the Nuvi do this? And secondly, what one would be best suited for it? Little confused about these driving GPS units. Looking at the 255W, trying to stay under $200.