Zippo isn't so good for a PSK, since the fuel does both evaporate and leak. Also, it's much bigger and heavier than a mini-Bic. And its spark wheel is not really any better than the Bic's. Neither is as good as a real Sparklite, so if you want a Sparklite, carry one. Those tinder-quik pellets seem less messy than vaseline cotton balls too. Countycomm sells a nice kit for $6.00:

http://countycomm.com/AVIATIONFIRE.htm