You're going to really need to calibrate either way nicozeg; even the 6655s are only +/-1C over a range we aren't interested in with water (60c eh?).
I just thought of one thing that you might want to consider adding MMZ: A power switch! My 6655 EVSYS board has one and it's really handy when you are setting everything up. Particularly with 4 sensors that you may be moving around a lot while putting into water and such. I can take pictures of the size of the package for the remotes tonight; I have a couple of them lying around at home.
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