I find I always have to lookup the value of the monetary stuff and Georgian British rules about inheritance whenever I go back and read Austen, it's the only part that's really dated, after one gets used to the sentence structure.

It's really deep in the series (about ten books deep) but Lois McMaster Bujold writes a sci fi space version of Jane Austen in a couple of the books of the Vorkosigan Saga one might appreciate more after reading a bit of Austen.