Well I hardly disagree with you here, I use ideals in the sense of meta-ethics or reasons to behave ethically. To put it the other way arounf, ethics are applied ideals. For me, ideals presuppose ethical dilemmas and I typically boil it down principles that help us form meaningful relationships. I think death is key here too, because it directs you towards the search for meaning. I think when Heidegger was asked how people could live more meaningful lives, he said they should visit cemeteries more often.
With regard to science and ideals, I think you can probe ideals in a scientific manner. The scientific manner necessitates that we test our assumptions meticulously and so we should also use this to test our ideals.
Another point worth mentioning is that science has increased the average life expectancy, but it hasn't necessarily made people happier in their entirety. One could hardly argue that hunter-gatherers were unhappier. Individuals were always surrounded by their family and friends. Personally I believe in forming meaningflu connections to others, which is (I) talking with them and not them, (II) learning to love people for their differences and not just looking for people that remind you of yourself. Not to say I don't like people with common interests though :D .