Definitely have it looked at if you are serious about purchase. It will cost you $200 or so but it is fully worth it since the car could be in bad condition from sitting around for 5 years. Also make sure the bolt recall was taken care of as that can be on EXPENSIVE fix.
Now as for pricing. I am not going to lie, a 2003 with 500 miles in a rough one to price for several reasons but mostly because the SRT market as well as the Viper market in a whole is in the toilet so to speak. The problem here is that if a price is stated, no matter what it is, for a few thousands dollars more, you can get a 2004, 2005, or maybe even a 2006 depending on mileage, so in the end you really have to think, is it worth it to go with a 5 year old car just because of the low mileage? My guess on this car would be $55,000 as well which I think is right on the ball but for $59,000 you can be in a low mileage 2005 with a warranty so I am not sure if it is worth it. It just all depends on what you want.
Good luck with the car.