I like the Garmins. Have a Garmin 76CSx (pricy but many less expensive models available). I have had some luck finding map programs that interact with the Garmin products. Additionally, I can download google map directions into my Garmin or save Google Earth/Maps to cache on my computer and get a realtime update as I am travelling (with the puter in the truck). When Im out hunting though, i dont use the GPS for navagating, stick to the paper map with that and use the GPS to verify/pinpoint my location...to much Army training using a map and a compass, in my comfort zone with paper maps.
As for the Rino's, look at the radio range and cut those down to about 10% of whats advertised...in the early days of OIF when we were using the motorola handhelds they were advertised at 7 miles...lucky to reach 1/2 mile.