Hey,
You can install a sampler option in the LE, you can read about it here:
http://www.korg.com/gear/info.asp?A_PROD_NO=EXBSMPL
I think that the bigger versions of the Triton come with more effects, the Pro version comes with 5 inserts, two masters and a global eq; the LE comes with 1 insert, two masters and a global eq.
Also, the bigger Triton allows you to expand the internal wav memory with their PCM expansion cards, I don't think the LE does.
Take care,
Nick