Don't quite understand your sums for data rate.
sampling : PC vs arduino : 44.1k/10k is 4.41
resolution : PC vs arduino ie 16 vs 8 bits is 256:1
so if you reckon the PC sampling gives 192kb/s worth of random, the arduino should give
192k /4.41*256 which is 170 b/s
or am I being particularly stupid?
regards
Allan