Up to date, yet inexpensive. The 4.7-inch HTC Smartphone Desire 510 sells for only 200 Euro (~$250), but supports the faster LTE standard despite its low price. We've subjected the Android phone, which is powered by a 64-bit Qualcomm quad-core SoC, to our battery of tests.
http://www.notebookcheck.net/HTC-Desire-510-Smartphone-Review.127078.0.html
Issues with the GPS. This device constantly loses connection to satellite signal, and is under investigation at HTC.
This problem has occured with Google Navi, Sygic and Navigon, and seems to be a production flaw, maybe overheating or power profile related.
In addition this was tested against other iphone and android tablets, and Navi Devices ( TomTom, Navigon (Garmin) etc. in an area that has great GPS coverage.