ALL '97 were 30th cars, celebrating the '67 Camaro. They all came with headrests and a dash plaque that says "30th Anniversary". V6 or V8, and no, they're not worth more because they're all the same.
Now, you do have the 30th Anniversary Edition Z28 and SS, which were white with orange stripes. This was a special package and these cars are worth a little more than their brethren of that year.
RS = V6 with Sport Appearance Package. Nothing more.