spawn right near a chest with a saddle and other stuff in it. Just have to dig down a bit. Great for getting that "when pigs fly" achievement.
888 is also a great seed for this. Requires no digging as the chest is right inside a cave on the surface very close to spawn. --- When a true genius appears, you can know him by this sign: that all the dunces are in confederacy against him.
That's the one I'm currently using. It has a nice variety. It's mostly green but has small sections of snow and desert. It also has plenty of those epic mountain formations but not everywhere. You still have plenty of more practical areas so as to not get overwhelmed. It has waterfalls and lavafalls as well. --- I was the turkey all along!