I second the 306 atomizer with a drip tip. The 2.0 ohm attys are supposed to be even better than the standard, but I've found the standard atty to be a great vape. You can screw it right on to your Ego battery.
One other thing, the nicotine in a cigarette is carried into your lungs on tiny smoke particles (actual products of combustion). The lungs can absorb nic that way, but they don't absorb much from the vapor produced in an Ecig. To get the most nic hit from an ecig, french inhale (draw the vapor into the mouth and then push it out and inhale it into the nose) or just inhale into the lungs and exhale out through your nose. The soft tissues of the mouth and the sinuses absorb far more nic than the lungs. You can, as an alternative, draw it into your mouth and hold it a while before exhaling and get nic absorption without even inhaling. That's how snus or smokeless tobacco works. You will get dryness of the mouth by doing that since PG absorbs water.