A friend of a friend has a 2003 Furuno 1712 radar that he is taking off a boat he just bought. Wants to sell - what do you all think it's worth? I think I can get it for about $700. Given that I need a radar and now have a radar arch on which to put it, this seems like a good deal to me. Right/wrong? Anything I should look for to make sure it's OK?