Without knowing how your Varicam is set up, it's really impossible to answer this question.
That said, pretty much all of the settings that affect the general look of the image in the Varicam are available in the HPX3000. If you use the Varicam in FILM REC mode, put the HPX3000 in FILM REC to match. For VIDEO REC, choose one of the FILMLIKE gamma modes. I would keep detail very low or off. Matrix settings won't translate exactly - to match a particular look you'd want to put up both cameras pointed at a ChromaDuMonde chart and look at the outputs on a Vectorscope.
If you don't have a particular look that you're trying to match, a little more info on how you intend to use the camera would help. It sounds like you want a real "look" coming out of the camera - perhaps to minimize the amount of correction needed in post. If so, I'd use one of the FILMLIKE gamma modes. 1 & 2 will need the least amount of correction (2 will preserve a bit more highlight detail), though 3 will give you a bit more correction range by giving you a flatter image (though not as flat as FILMREC gamma). I'd leave pedestal at 0. If you want to crush the blacks a bit, use a bit of negative black gamma. You could also raise master gamma a bit, perhaps to .50 or a bit higher if you want a contrastier look.
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Jesse Rosen
Director of Technical Development
Abel Cine Tech, Inc.www.bustedskull.com