I personally would not use the subway, having had a few experiences that were very uncomfortable, going back a long time ago. LIRR is expensive, but a nice commute and for the men, there is a Daf Yomi on the train in the morning. Can you imagine doing that on a subway in Manhattan (or maybe they do, who knows?)!
Inwood is an up and coming neighborhod for young frum couples,with the Yeshivah Ketana there, as well as a young ladies’ seminary, but bear in mind that as Nassau County, you would be subject to their taxes. There are pluses and minuses to everything.
Far Rockaway seems to be a “stop gap” for many young couples who really want to live in the Five Towns, but can’t afford it for their first living space. So they live in FR for a few years and then move. That said, the neighborhood IS considered prestigious for a number of reasons, primarily because it is relatively affordable, but still on the heels of the suburbs. There is a very different feel there, as compared to Brooklyn and Queens. It’s all in what you are looking for, as GAW suggested you describe.