Just so happens I'm in the same boat. Looking for the perfect tunnel cams for preexisting damage. Thus far I would suggest Axis as being a quality camera. I am currently testing the Act E77 but at this point I am not very satisfied. I would suggest a varifocal lens (optical) though because if you have to rely upon digital zoom quality goes out the window. If you'd like to compare notes over the next month or two please contact me for my email. Not sure how on this board.