i made the jump too, almost 2 years ago. i wouldn't count on the on-air hd signals, i've been through multiple tuners, tv's, and antenna and there is no overall solution, the signal is intermittent.
i started off with netflix, but have simply devoured it, and recently canceled. currently going with amazon prime, hulu regular, youtube (for documentaries) and more & more channel websites for streaming their shows these days. history channel, fxnetwork, etc, a bunch all offer their shows via their websites. now they each have strange programming guidelines, like only the last 5 shows, or the 1st 5 shows, etc.
also, if you are in new york city area, there is
https://www.aereo.com/ it's planning on expanding