from the title it sounds like you have a CK inch threaded and want to convert to CK inch threadless?
i did this a number of years ago, basically the CK kit just comes with a new top cap/bolt/starnut and a new bearing cap for the headset to replace the integrated threaded bearing cap/nut.
all you really need is the bearing cap and top cap - these are US$18 and US$10 respectively from www.speedgoat.com
- your local shop should be able to sort you out a bolt and starnut.
i'd also second the recommendation for aspire velotech they've never let me down.
bear in mind that unless you have a source for an inch threadless stem, you may end up needing to go to a 1 1/8 threadless stem on your new threadless steup - in which case don't forget to buy a top cap in the 1 1/8 size flag the inch topcap it won't work for you.
the one inch headset will never be obsolete