For handheld radios, 5W is sufficient!
When 5W doesn't work, 10W won't either.
The N76 APP radio currently offers most of the features you'd expect from a hobbyist radio, including: aviation reception, GPS, full APRS transmit and receive capabilities, repeater support, automatic SSTV decode/transmit, and call logs. It also includes the latest satellite communication with Doppler processing and call recording.