Thanks to all - I ended up buying the garmin gpsmap 62sc as I was concerned how visible screens were in direct sun light. Many videos say it is the best for this.
Is been a lot of fun to use, 22 caches so far, the keys are slower than a touch screen, but compared to my iphone it is way more accurate and much easier to view in the direct sun. I still may buy another gpsr and use the 650t for urban geo cahcing.
Matt