What you ask is hard to answer, because there are so many options available today. Different battery devices and different juice delivery devices (ie tanks) tend to specialize for particular vaping styles. Being new, you likely don't yet know what your particular vaping style is. This can only be discovered by trying different vaporizer setups.
Being a 2 pack per day smoker, the nicotine content in your e-liquids will be most important. 24 mg is generally recommended for that amount of smoking. However, if you find it has too much of a throat hit or harshness, you may need to drop down to 18 mg or 12 mg.
I would not recommend the Triton setups. They use proprietary equipment forcing you to use only their products. Most other setups use non-proprietary parts to make it easier to custom switch to other pieces of gear as you desire.
$40 is not a very high budget for a vaporizer setup. $100 for a battery device, tank, replacement coils, and e-liquid is a better price range for anything of decent quality. Then, since we are so dependent upon batteries to vape, you need a backup for everything in your setup. Don't put yourself in a situation where you need to buy another pack of cigs if your battery fails or your tank breaks.
I'm pretty sure that you spent at least $100 a month if you smoked two packs per day. Convert that money into a quality setup for vaping. Once you have your batteries and tanks, your subsequent costs will be only for replacement coils and e-liquid. That will end up being a significant cost saving over smoking.
This blog should help with the lingo:
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