Hi ISTFlyer and thanks for the feedback.
I agree LH is the least private option for me, so thanks for confirming. I think I'll forget about that one. I don't actually live near EWR (I live in Sydney, Australia), so the EWR remark was just about having to get into Manhattan from the airport.
Also thanks for confirming that Austrian is a good choice....that's what I've read whilst surfing the web as well.
I assumed United Polaris was a big step up from the previous United J offerings, so was excited about that. Other blogs and info seem to say it's not a bad product. But I guess it's how it compares to the European options.
I'm a little closer to choosing Austrian now.
Thanks.