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For an eGo class battery... I would stick with Kanger 2.0 or 2.2 ohm coils. First, the battery really isn't built to handle the low ohm stuff Kanger is putting out - like the 1.5 ohms coils. And the Kanger BCC clearo design doesn't really work all that great with the below 2.0 ohm coils - they get too hot, too fast even at your lowest voltage setting. At least with the higher resistance coils you can always adjust the voltage down far enough to suit your needs and likes. For me, even the 1.8 ohm Kanger coils didn't give me any place to adjust the battery voltage low enough.
What voltage? You have to get kind of Zen about this. For any new coil - or any new liquid for that matter - start at your lowest voltage and only move the voltage up until you hit the flavor and vapor production you are looking for. New coils don't require as high a voltage as older coils that are getting mucked up from use. And every liquid is different. One flavor might respond well at a certain voltage (heat) while for a different flavor that same coil and same voltage may not be optimal.