I am purchasing a dna 30 mod and the website I found has it paired with a tobh atty for 85 dollars and paired with a kayfun lite plus for 115 dollars. They come with the exact same things except the tank/atty obviously. Any advice as to whether it's worth it to spend the extra 30 dollars for the tank and which to buy would be greatly appreciated. Also I am currently vaping on a brass monkee rda.