Thanks for the replies... There's actually two major categories of programming I'd like to get, one being streaming Internet-only stations like This Week in Tech (especially after May when TWiT starts 24/7 live programming), Wired, and CNet which aren't available via FTA, and the other are some of the live news feeds like AJE, CNNI, BBC, etc which aren't available via DishNetwork. PBS was another big reason I hoped to go with an FTA system, but honestly most of the PBS programs are available via the Roku (I think). Also I'm not hugely into sports, but granted we still have our Dishnetwork account I can use that for sports and OTA programming.
What I like is Roku has a SDK that allows users to create their own 'channels' based on streaming content, and people have come-up with some neat ways to get streaming content of all sorts to the Roku. It's not as diverse as the programming via FTA, but it seems there's always something new.
In the end I'd LOVE to have an FTA system setup at home because the thought of getting this content directly from the airwaves is awesome, but for the cost and setup that's involved with an FTA system I wonder if it might be simpler to just get a Roku and run with that for now until I can get enough funds to invest in a more robust FTA system (motorized dish, DVR receiver, etc).