It's a hard one to predict Bob, somtimes I see a twin in good conditon, with a catcher, and think to myself "That's going to go well" only to see it pull a much lower price than expected, othertimes, I see one that I dont even think is sellable, and it hit's the jackpot (so to speak)
I would get them all cleaned up, take some nice photo's, and pop the pic's up here, to see if we can't help you work out a ballpark figure.
It's a hard game to predict, but if you put it up for a decent amount of time, to get pleanty of attention (the last few minutes are what count, but the longer the listing, the more people will be there at the end) with good, clear pictures, and a little detail, you should be able to get a good price for it all.