It sounds like you have not been with the current company for long. I agree with Magisch. Don't mention current job (simple discretion does not impugn your integrity). If new company asks during 2nd interview, say you took a position temporarily to get you thru economically. I am an employer, and though I wouldn't be happy to have to start interviewing again, I would understand if a recently hired employee got called back from a previous interview more in his/her career path and resigned. At will works both ways. This is business and you are setting your course by your career choices.

I want to thank all of you for you input. it really does help get my own head out of the situation & look at it objectively.