The non-tapered head tube, rear dropout configuration, and 25.4 mm handlebar indicate the model year of this bike to be 2007 or 2008. The 2008 model retailed for $570, and the Bicycle Blue Book indicates current values to range from $228 (like new) to $145 (fair). The 2007 model retailed for $430, and is currently valued at $158 to $101. This one looks like good but not excellent condition. Cables and rubber indicate that it should give you an enjoyable ride home, but you might have to do some replacing (including the chain) before next spring.
In general, FXs are darned nice bikes. but a lot of them get used for hard, all-weather commuting. Parts get worn and the bikes tend to get neglected. This one doesn't appear to have done that kind of duty, but it shows some miles. I'd start the bidding under $136 (a "good" 2007) and go no higher than $195 (a "good" 2008), depending on how the test ride went.
2009 ($570 MSRP) featured upgrades to the frame, Deore derailleurs, wheels, and seat post. This is definitely not one.