If you want "salt", go for IO and adjust the parameters with dosing like Brad said; it will still be cheaper. If you want "nice salt" (I am not saying "good" salt since that can bring lot of debate
), H2ocean is possibly the best bang for buck. Which salt you choose is completely personal. People can have great success with literally any salt in this hobby; it all comes down to personal preference. Some people like salts which they dont have to measure and dose everytime they do water change while some like to go easy on the moneythey spend on salt with additives (mostly for bigger systems).