Yes, in Calgary, I paid less than MSRP, but I factory ordered. I paid the $500 dealer fee, and the normal $2000 freight fees, but no "nitrogen/etched glass/bullshit fees. I ended up getting all these extra (nitrogen, block heater, locking wheel nuts, etc) for free. I think they accidently installed them to be truthful...LOL
Personally I think the LED taillights and Heads Up display (and heated cooled rear seats) is worth it for the SXL, a lot off people will tell you it's not (I love the heads up display personally).and the small bit more you pay for the Nightsky (above the SXL), you will pay for the rims/stickers anyways.
$4500 for from SX to SXL-Nightsky is a lot, but for me it was worth it as I wanted the black look.
You really just have to decide if $2500-3000 difference is worth it for you for the extras from SX to SXL, because you will be paying the $1500-$2000 to get black rims, and letters, and badges or more anyways for the SSXL to SXL-NS bump.
Dechroming alone will cost you over $1000, probably closer to $2000 if you are even considering that. So if you are, now you are only paying $1500 for all those extra cool, options for the SXL, and have factory blackout stuff.
You can probably get the SXL-Nightsky out the door (taxes, fees, etc) for $61,000 (about what I got it for). You might get a better deal now? Not sure there is any on the lots though,
So in the end you have to decide what you really want I guess.