Get a nismo or a sub nismo model. It will costs less, and for the money you didn't spend on the RS badge, you can make the sub RS models perform better. Unless your making big power, or racing the car, the LSD will not effect how the car drives every day, or if your ripping around a canyon road. If the diff is the big thing for you, you can swap out to a wavetrac for relatively cheap if you can do the removal of the trans yourself. As mentioned above; the gear ratio in the RS really isn't that great.
More things to note with the RS: The axles are NOT AVAILABLE at all right now. Not from nissan, not from aftermarket. You have to go with $2000 upgraded ones if you want new axles. The RS seats ALWAYS rip and get ruined, just the nature of the tall vehicle mixed with the tall bolstering, so if you like the seats, get ready to re-upholster them. The RS tune is barely different than the sub RS models. At $900 custom dyno tune will net you more power stock to stock than the RS. The stuff about the RS having better internals is just nissan advertising junk. I have personally taken RS and sub RS engines apart side by side. Everything is the same. Rods, bearings, pistons. All the same. Part numbers have recently been updated by nissan to prove this to be true. Engine bearings are the same part numbers for ALL Jukes. As for the "upgraded oil pump", the only oil pump I have ever seen fail on a Juke, was in a 70k mile RS. So, take that as you will.
Another thing on the topic of the seats: They are not comfortable. That's not objective; they literally aren't comfortable. I have seen two RS Jukes where the owner didn't add some sort of extra support or padding themselves. They are racing seats. Hard, unforgiving, tight fitting racing seats. The Nismo seats are comfortable, offer loads of lateral support, and don't wear out like the RS seats. I have several customers who do auto-x and track days with nismo's and they work fine.
At the end of the day its up to you on what you want to buy. So. If you can find an RS manual, go for it! If you cant (they only made a little over 8000 of them if I recall correctly), then grab a sub RS six speed and have at it.