After I got over eGo's I started looking into mods. When I started vaping, they looked ridiculous and clunky to me and I never thought I'd try one, but now I just feel stupid for ever having that thought cross my mind.
If you want a variable voltage mod, you could try the Knight Rider/Lavatube. These things go from 3.0 to 6.0 volts in 0.1 increments. For some, higher voltages = stronger taste and better vapor production. The only problem in my opinion with these is that you'll need to start buying higher resistance cartomizers. 3.0 ohms is usually good. Anything under that and your juice is going to taste like burnt toast. But once you find a good spot, that 6 volt vapor is delicious. Also, you can't use dual coil cartos at high voltages with the Lavatube. Safety feature.
If you want something less complicated, definitely buy a Silver Bullet. These things are durable and I would highly recommend them as a first mod for anybody. They aren't variable voltage but thats not a problem. In my opinion, they're perfect with low resistance dual coil cartomizers.
You could also try getting into tanks with your new mod. I have yet to hear from a carto user that doesn't love tanks. I have yet to use any myself, but I think I'll be purchasing some soon.