This one is really hard to price as Softrides are relatively rare and have limited appeal. People are confused on how to size them. There's no traditional seat tube or even stand over height. You have to size based on leg extension range and even then you have to compensate for the beam sag, which varies depending on rider weight. Consequently, the market and selling prices tend to be low. The market appeal and value on this one is further depreciated by the fact that it uses 650C wheels and appears to be a small frame.
Maximum return will be gained by marketing towards triathletes, as they are the cycling discpline most familiar with both beam frames and 650C wheels. Hopefully, the OP lives in a metropolitan market with a good triathlete community and a triathlete club and/or local race organizer with a website where they could market the frame. That's how I marketed my Softride Powerwing 650. As, for the price, that is impossible to say given the non-traditional nature of the of the frame and not knowing the frame size, beam rating or the OP's market region. Members on the triathlon forum may be the best source to provide an actual value range, once the OP has this info. If not, all I can suggest is to list it for what your Dad paid for it and cross your fingers.
Last edited by T-Mar; 02-24-12 at 07:23 AM.