IIRC, people have suggested that if you're down near the end of your money at a good count, you should bet either 1/3 or 1/4 of your stack, so that you have enough for splits/doubles or at least another round.
As far as how much to bring to a casino, I'd run CVCX and figure out a -2.5 to -3.0 SD session, and bring that amount.
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