This is a review by GrimmGreen one of the most famous people on YouTube for vaping reviews. He's been vaping for over 3 years and he's also about 3x more popular than that PBusardo guy. He has every ecig in the world or dang close. He knows what he's talking about.
An Ego Twist C would do you proper. You can get them from
AltSmoke.com | Personal Vaporizers | Electronic Cigarette | Ecigs | AltSmoke.com | eGo-C Twist Battery for the cheapest I have seen on the net. I recommend the 1000mah size and although they are a little on the long side, they'll last you all day. I recommend you get 2 of them. You'll need a USB charger for it though, they sell them at Altsmoke too but there are better places that have them for less money and they come with a plug adapter for the wall outlet. The EGO C Twist is a variable voltage unit with a 510 adapter (the most commonly used adapter on the market by far) which will give you the greatest versatility there is.
Now compare the vapor that GrimmGreen blows out versus this anemic vape that comes out of one of those tiny cigarette shaped, and often recommended Volt ecigs:
VOLT - INTRO to Ecigs & The VOLT Starter Kit - Smokeless Image - YouTube
No contest. The Ego C Twist puts out 4x or more vapor. The Volt will die approximately 3 times per day on you and will require constant charging. To avoid that you will need what is called a PCC a Personal Charging Case which is a cigarette pack sized charger that you put your ecig into in between vapes. By the time you buy all the stuff you need for a Volt you are going to be in for more money than 2 ego twists and a charger and you're not going to get anywhere near the satisfaction.
Because you only smoked black and milds, I would recommend you start with a medium strength nicotine in your ejuice. I would try getting 18mg and 12 mg strength. Use the 12mg for all day vaping and the 18mg for the tough times. 70/30 PG/VG mix is probably the most versatile because if you get more than 30% VG ejuice there is a chance it will not wick properly in whatever cartomizer/clearomizer you may choose to go with your Ego Twist.
For Cartomizers I recommend Boges or Smoktech. For Clearomizer I recommend Stardust (the Ego Vision Clearomizer is the official name of this product) or the Vision Vivi Nova which comes with 3 different atomizer heads that you can swap out and each has its own resistance (low medium and high) which is perfect for a variable voltage device like the Twist. You will want 2.0 ohm for low voltage range (3.6-4.2volts) and you'll want 3.0ohm for the higher range (4.3-4.8volts) that the Twist can achieve.