For true FTA, you definitely want an HD box... It's hard to beat the price/performance of the Openbox S9 or S10, it has a great blind scan and will also do DVB-S2. Those two features are a must... You will use the blind scan to find new feeds, and many channels are using DVB-S2 nowadays to save bandwidth.
If you want to spend a little more, the AZbox is another good choice, it does DVB-S2 as well as 4:2:2, however the blind scan is a little slower, but still acceptable.
Do you have the right equipment to receive true FTA? You'll need a 36" or larger dish with a standard linear LNB and a motor would be a very good idea too.