There are a whole host of rare and unusual JS
guitars that have been produced over the last 20 odd years.
They started off with the original JS1 which has been available in both HH and HSH configurations. They're been available in black, white and "inferno red".
The original Chromeboy model was the JS2. Rare as hens' teeth, but possibly the "ultimate" JS
We then had the JS3, 4 and 5 the Donnie, Electric Rainbow and Rainforest graphic finishes.
Next was the JS6 a natural finished mahogany bodied, fixed bridge design.
Around 1994, the model designations changed and the budget series introduced.
The graphics were phased out and the JS1 morphed into the JS1000 still made in Japan, whilst the JS100 was a lower priced, Korean option with own brand pickups and lower cost hardware.
Similarly, the JS6 morphed into the JS6000 whilst the budget option fixed bridge was the JS600.
A couple of years later, we saw the JS700 with wraparound bridge and twin p90 pickups. It's unusual as it had a mahogany body and neck. These have been made in Japan AND Korea and can be most readily distinguished by the 21st fret inlay.
Around this time the JS900 also featured, another Japanese beast and like Scanlan said, it lacked some of the trick JS
After that, the JS1200 appeared in Candy Apple Red with colour matching headstock and a revised pickup, other than that it's essentially the same as the JS1000.
There have been 10th and 90th anniversary models in Chrome and chameleon/flip flop colours and that's about it.
If you decide to buy used, you should know about some trem changes in 2003 (to the Edge Pro trem) this was viewed less than favourably by some and many (including Satriani) seem to prefer the older style bridges.
Personally I'd go for the JS1000 in black pearl as the most bang for the buck. Mine seems to be bullet proof. And, in the very understated colour never looks out of place.