BG2EFX Essentially, the UV380 with GPS from Teasycom, in the 5W version, is sufficient. There seems to be an issue with 10W supporting 77.
BG4ILW The 380 has some functions that require a combination of keys, which is less than the MD760. However, the MD760 doesn't have GPS, which makes it more difficult to use. The md2017 key has GPS and also a trackball, but the antenna is quite strange.
Liridice An example of a device compatible with the OpenGD77 manual is the 760. Other devices have different buttons, but it's easy to get used to them. I recommend buying one with a larger screen; I personally chose the GPS version of the 380.
BA4QBB 1701 offers excellent value for money; I'm currently using it, and there is also a Chinese GD77 firmware available.
HeyCharlie The uv380 version without GPS was found on the forum, and there was a post about installing GPS. The price was slightly cheaper, and the main reason was that the GPS worked well.