I would suggest the Canon M100
Firstly you don’t necessarily need a 4K resolution to get the most out of your videos as
@sk66 has mentioned. It is very expensive and only high end cinematographers are using it in the film industry.
For YouTube purposes you need an aspect ratio of 16:9 encoded at 1080p: 1920 x 1080
The Canon M100
- It is a 1920 x 1080 Full HD (fits the YT standard)
- It is user friendly as it has less dials and it is a touch screen
- It has a great battery life which allows you to shoot up to 2hours +
- It is compact and light weight for when you want to take those nature photographs you mentioned
- The SD card is on the side which means you don’t have to unscrew it from your tripod to change cards when recording
- It has low light settings ISO (100- 25, 600)
- It has a sharp autofocus
- It has a flip screen which allows you to see yourself while recording
- It is affordable and within your budget constrains
The 1920 x 1080 Full HD
- It means that you get more quality
- Overall sharpness
- Optical image stabilizer in the compatible lenses
The downside of this baby has to be the sound, it’s not clean and you won’t be able to attach a mic as it does not allow you to do so. You will need to buy windjammers to get rid of the white noise.
I hope this helps
.