With a Paké frame, a carbon fork isn't going to help. It's a heavy frame, I ride one too everyday and I love it...rock solid. As a messenger, keep what holds you up steel, as you'll be putting loads of miles on those components, bumpin' bangin', and generally thrashin' it up. Good, strong, wheels will make your life better. 32 spoke minimum x3. You don't want to be messin' on a HED/carbon fork, unless of course your posenger'ing, because you'll be doing more miles than a touring bike for the most part. One wrong move (pot hole/curb/car) and you're not riding home, or worse, face planting. It's a work bike not a race machine. Crash that C'dale with Hed and see how it folds up, whereas you'll just get up and keep going with the Paké.

Wheels
BB
Crank