We have a Oregon 450, Nuvi 1450t and a 60CSx
You can down load waypoints from Gsak into the Nuvi and see them on the screen. We really enjoy the big screen, but would recommend using a handheld unit once you are at the cache site.
We really like our 60CSx for navigating at the cache site mostly because we know how to use it better. We are just learning to use the Oregon for navigating at the cache site. The one thing that is really nice about the Oregon is being able to quickly bring up the cache information, which is quicker than looking it up on our ipod.
Hope this helps
Monkey Man & Lulu