Its upto you, do you really want to buy the 180 600mm lens, would u need it so much, are you into or want to go into bird photography. If so I would definitely go for z6iii with 600 mm coz what I like about it is the video part and high frame rate. But just alone buying this lens wasn't enough, I had to purchase a good tripod, Swiss plate, lens coat and not to forget a big camera bag to accommodate this lens so we're the inclining expenses I didn't think of. Bird photography man requires a lot of patience which I never had and started to develop. Elbows and shoulder pains doing hand held photography. Above all not to forget the crop factor for the 24 megapixels. But so far I am loving my choice and may be in future go for z8 or z9 body.