There's nothing wrong with aesthetic beauty. Which woman would you rather be seen with? Kiera Knightly (Imperial Clipper) or Andrea Dworkin (Federation Dropship)?
My guess is that the Courier will sit in the same sizeclass as the Vulture - but it will trade a modicum of firepower and shield strength for a LOT more engine power and FSD range.
This would make it quite viable as a lightning-fast intercept fighter, and also allow it a little more flexibility to do other stuff (like being a courier.) But it wouldn't have quite the same acumen as the Vulture does for cracking open bigger targets.
saying a "courier" ship should have long jump range is like saying the FDL is a bounty hunter which FD gave it very small jump range - so we never know ,at least in FD's world...