(EDIT NOTE) - Oops, this was an old thread from Sept 2017 suddenly resurfacing. Content is the same for others considering, and updates with newest model.
Went through the same thing as upgrading wife's point-n-shoot long zoom canon. The zoom was so long that many times she would lose or couldn't find the subject on the LCD, and had no viewfinder so the sun would wipe out the LCD further complicating things. Small and had a viewfinder were her two requirements. Sony, Panasonic and Olympus models were the short list, and of them, Sony was the smallest with the largest sensor. Daughter had/has a 5000 with the attached external viewfinder prior to the 6000 being introduced. Son has a mixture of Panasonic/Olympus body and lens and very impressed with the photos he takes. Wife preferred the feel in her hands of the Sony a6000 over the others, so that narrowed it down. Overall takes great pictures, and the fact that it is still sold despite now 3 replacement models speaks for itself. Price hasn't really gone down that much, just appears so as it is the 'low price leader.' I think I paid $1000 for the 2 lens kit (16-50 and 55-210) while that same 2 lens kit is around $850 today, but they usually advertise the camera and 16-50 for around $600. Overall, she has been very happy with it and I have had to show her some of the more advanced features - like manual focus to avoid foreground focus in wildlife shots. Not as intuitive as my a7rII but was able to program one of the buttons to simplify manual focus. Battery life is much better than on the a7rII and they use the same battery.
Doesn't sound like you need a full frame...and yes, lens are significantly more expensive - plus the kit 28-70 was/is cheap, rubberized that I saw several not holding up to store traffic on display. I actually started mu Nikon transition with a borrowed A7, and there is a significant difference with the improvements in the A7II series. If I had to replace my wife's A6000 today would seriously look at the A6400 which was introduced last week. Scratching my head as marketing put it as the A5000 replacement...but frankly it is a A6000 body with viewfinder, not a A5000 form factor. Slotted between the A6300 and A6500, it's superb features doesn't justify the slight premium for the A6500. Prior to it's introduction I was looking at the A6300 with it's stronger video over the A6000 as wife's camera becomes a second shooter for me. Crop sensor is also great for wildlife with the longer effective lens than the same lens on a full frame.
While you are not in a hurry, would suggest playing with them in the various stores. Also might want to rent one for a weekend, etc. See which one you feel most comfortable with.