In the United States, I'd be skeptical of spelling it "sceptical".
>Hi everybody,
>
>Just want to learn which is more accepted form for this word. I wrote it with a k first and decided to verify my spelling and found
>
>
http://dictionary.reference.com/browse/sceptical>
>which suggests both spellings. So, which one is most acceptable?
>
>Thanks in advance.
Jim Nelson
Newbury Park, CA