As of this posting I'm just under 500 finds and have been using a HTC Hero or HTC Evo 4g on most of them. My dad uses an Oregon 450 so we compare our results alot when out caching and while the Oregon is more accurate, these HTC devices are not far off. It helps to use the app "GPS Status". Open the app> hit the menu button> select tools> select Manage A-GPS state> then select download. Doing this every few days seems to really help the accuracy. In my opinion the main reason to go with a dedicated gps would simply be that they can take more abuse. My phones been dropped, rained on, and covered in pine sap already. I told myself that once I get to 500 caches I could buy an Oregon, so I'm starting to shop around now.
We're only at 16 caches but have the exact same setup. HTC Hero until yesterday when i got the EVO. We found the Hero worked pretty well and got us within a few meters of most caches unless there really was a full tree canopy overhead. In the open of a field it got us even closer. Can't wait to try out the EVO this weekend. Just in my house it was getting a lock from 10 to 12 satellites while the Hero was getting 8 to 10. Now if I knew what that meant it would be much more meaningful but usually larger numbers are better
