I am currently shooting with a Nikon D3400. While I am content with the quality of the images I am getting from it, I am not so with the ergonomics of it; I feel I require something with a screen on the top, and switches/dials for changing shooting modes, focus modes, etc. I am on a budget, and I am aware of the 7xxx series of cameras. But I have also noticed that the D300 is regularly available at a bargain. Would it be wise to switch from a D3400 to a D300, or save up a little more for a 7xxx camera? The biggest thing I am concerned about in terms of photographic quality is high ISO performance. I generally do not shoot above 3200. For those of you experienced with the D300, how does it perform at that level?