Wow cant believe I missed this thread. I hate to break it to you buddy, but your car is an L model with LS wood grain center dash, how can i tell? The GS came with several options including Heated seats, Digital Climate control, GS hammer style wheels, traction control, wood grain, more aggressive suspension, and a sunken grille that was painted body color.
As far as the difference between the USDM and JDM legends there are a great number of those too, and Type II engines in Japan still came with the TYPE II badge on the engine, your engine unfortunately is still a type one.
Here you can easily see the grille:

Here you can see the GS wheels
the legend guys in atlanta try to stick together, since enthusiasts for these cars are a dying breed, so head on over to acuralegend.org if you need or want to find out more info on these cars.
As far as your car, its a good base to create something unique.