JS is the 2wd convertible, I think with perhaps the 1.3 engine. JX is the basic 4wd 1.6, and the JLX has the additional trim, split rear seat, power windows, nicer wheels, additional plastic trim, etc. The 'L' stands for 'luxury'.
I used Southwest one time, and was unhappy that they charged me Texas sales tax, when I live in Nevada. Not sure if the other sources do this or not. Although it will be a moot point when we can no longer get OEM parts in the USA.
My shop is in Miami and I NEVER buy anything here. All the dealers mark up wholesale by 10 % and always charge a f****** core charge on starters and alternators which Keith never did and he never charged me to ship from Texas to Miami. Keith also told me the other Suzuki sources in Texas are no good. Now that Suzuki has left the US market things are going to get harder if we want real as opposed to chinese parts.