Hmm.
Guatemala or China.
A lot of people will tell you Palau, but I'm not fond of it. The pre-merge is VERY repetitive and certain circumstances rob us of great characters, and the winner is rather overrated.
Guatemala has a very good cast and exciting post-merge. China has an incredible cast and is consistently exciting and it has a very satisfying winner.
You can torrent them all or get them off of YouTube, though.