we need a little more information than that. What are you doing with the car?? road racing? drag racing? or just driving around the street? There are a million different shocks out there to choose from
I also have 17x9 rims in the rear with 24mm offset and 255/40/17 tires.
I just bought a set of Saleen Racecraft N2 quad shocks and will be getting them in a week. I got a good deal for $140 shipped for a set of two instead of $99 each.
I would have went cheap with some KYB's but I've heard about rubbing issue's.