Your KDSS is likely to be a nightmare. That is more than enough to turn me off. The pitting up front is in the severe category and replacing the joints is going to suck. Everything is going to have to be torched-cut off. I paid 46k for a rust free 16. I then went over it with LPS3 to stop any future rust.
Note: For folks who aren't aware of LPS3, it is not one of those tar/PAH sealants, it is a great antioxidant for or avoiding or stopping rust on untreated iron/steel or worn coated aluminum. I use it on aircraft and anything that doesn't directly abrade. Spray it on your KDSS valves if you ever want to adjust the screws.
Autotrader and Carmax can help inform your thinking, but look at TX-AZ-CA for decent rigs, you can find what you want.