Yeah, it's gonna really boil own to what you use the car for. If you drive it as a daily driver and like to have a little fun on the twisties from time to time go with the Teins. They offer arguably the best balance of day to day comfort with good handling.
However, if you want an Auto-X monster and don't mind a filling loosening ride, go with the JICs. The handling they provide is awesome. I haven't had any experience with the FLT-A1s. But, the A2s are amazing. So, I would assume the A1s are the same general idea, with a few less features.