I personally dont like soft(<650lb. front 200lb. rear) springs on these cars. I think the Bullitts are too soft, and B's are even softer(lots of body roll, movement). So from you list I would choose C springs.
You want hard ride? Get some Steeda springs. I have either the comp or sport ones. Haven't found the part number yet, but found the Steeda logo on 'em. My Eibach Sportlines had a softer ride. I like the "B" springs. The 'C' springs are almost too harsh for me. These pigs we drive aren't made for turns. Unless you spend lots of money on a full suspension. 'B' equipped cars are almost like stock feeling to me. The B's lower it enough to look good, and don't beat you to death when you hit a pebble in the road. I am dumping the Streeda's for some B's pretty soon.