I think better mean no cheap resistive sensor and something like a PRT platinum tip. It could be smaller then too... platinum is 1600 an oz it will drive the price impossibly high.
I think if the sensor reports directly to a chip at the probe you can get better the chip than reports the probes findings to the board.
I would be happy with 1º hell even more 1.5º off if it reported online. You might give though to teaming up with Dion and piggy back on existing probes (as much as I want a different shape) it would be simpler. Perhaps probes before the rubber sheath is cast? Just thinking.