I have a 35SE that I bought new in the early 80's. I would guess it is worth about $100, but I would not sell it. It has been with me on most of my trips and given me some great photos, some of them posted here. It is a bit hard to use until you learn to guess the focus, and requires a service now and then. They do wear out though, mine is nearing the end of its life. The negative spacing is a little uneven now due to worn gears, but I will use it until it dies.
If you can get a nice 35S for about the same I would do it. I think you will be happy.