Koni RACE will be just fine. They win lots of races. Get the Koni threaded sleeves, they are a little nicer than the Ground Control ones, IMO. Just main springs. Get the spacers with your koni sleeves to run 2.5" springs. 2.25s are a tiny bit lighter, but used 2.5s are EVERYWHERE for cheap.
Cage: Assuming you have welding skills, for a GSR I actually think I'd call Kirk Racing in Alabama and get them to send you a "You weld it" kit. They've done lots of GSR cages, and the last one I saw was very nice and very strong. If you DON'T have welding skills, the people here can point you to a good cage guy near you.
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