Got it. My apologies. I wasn't aware of the Sports Excellence exclusive blades. You mentioned carbon steel, so I thought you were referring to the LS5; which is marketed as 'carbon steel', but is, in actuality, also a coating.
Based on the description you provided, what you're looking at appears to be almost purely cosmetic. Or, put differently, those runners are black solely for the sake of being black. Which is ridiculous.
All of my other points are still germane:
Stock steel from the major skate manufacturers is largely crap - including this black powder-coated stuff;
Buy the skates that fit your feet and budget best, without regard to the steel that the manufacturer/retailer chooses to put on them. Then, if you're so inclined, change the blades. There are companies out there that make REALLY good replacement blades;
Coated steel isn't a panacea. Though it CAN hold a edge longer than uncoated steel, that edge can be brittle; and
Even with coated steel, you still have to sharpen your skates regularly.