i cant help you with the prices, but i can tell you some ways to tell diffrent models apart. first thing is the valve cover, the GSR's will have DOHC VTEC written on it and the LS and RS wont. the ls and rs will both have a brake light built into the rear window and the gsr wont. the gsr's tach goes up to 8k and the ls and rs dont. 94-95 gsr's also came with silver 5 thick spoke rims. only other thing i can think of is that gsr's never came with auto tranny's and ls and rs came in both auto and manual. goodluck