Easiest way to tell is to jack up one side of your car and put two of the wheels on it. If there are no tires on the wheels, lower the jack a wee bit so that the car is sitting at approximately the correct ride height (without the rims touching the ground). Then you can walk around the car and compare old to new.
I like your existing wheels, but I do reckon that the replacement ones will look 'meaner' on the car!
Old ones are 14" Sears specials ($199 for the set) bought the day before a 1200 mile trip to Canada when they told me that one of my wheels was really bent and couldn't be balanced. They then sent me out on the new wheels without balancing them or telling me that they weren't balanced because they were out of the sticky weights (at least that's what they said) which ruined my front right wheel bearing after about 1000 miles and cost me $200 in Canada to get fixed. It was a fun trip.
The Buy it now is $400 but I'm going to watch and see. Powder coating wheels costs around $25 per wheel on average so this is a pretty good deal for some semi-rare wheels. Don't anyone feel bad if they buy them as I haven't decided whether or not yet.
Grant Hughes
Denver, CO
http://www.nocoastmotorsports.net