just be caution when cleaning the leather seat on LIMITED. Those little holes on the seat for heat/air, you don't want to use any leather conditioner on it directly.
In terms of products, I think you can just use any leather cleaner/conditioner from most auto stores.
If you are really into it, I suggest you go check out the clublexus forums, I remembered reading post about how to take care of the leather seat.
or check this out from Siennachat
http://siennachat.com/forum/index.php/topic,115.0.html