You're right...there isn't much left on analog C-band. Most free-to-air stuff has moved to digital.
You'll want a MPEG-2 DVB receiver that you can "slave" to your GI 650i. Thankfully, you can find these at low prices, sometimes under $100.
If you can speak Spanish or Portuguese, you might want to move your dish a bit to the east so you can see I-805 and PAS 9, which contain plenty of such programming, or buy a feed with circular capabilities (both H/V polarities and L/R), so you can see NSS 806 at 40.5 which will give you a great selection of channels from the Americas.
There is a lot on Ku-Band. I only have a Ku dish, but using my Fortec Star Lifetime Ultra blind-scan digital (DVB) receiver, I can pick up from international channels from Cuba, Netherlands, Romania, Iran, and Thailand, among many other countries, tons of newsfeeds, feeds of sporting events, and much more. You definitely should get Ku. Be advised, though, that because digital is far more economic than a full-transponder analog transmission, most feeds have moved to digital. An MPEG-2 DVB receiver, as I stated earlier, will not set you back far.