$300 budget, I want the best possible vape I can get.

[spookyluke]

Uh, please tell us exactly how one sets a dna to a fixed voltage? Both of mine only allow one to set wattage.

Use ohms law calculator. Enter resistance of coil and 4.2 volts and figure out what watts you need.
Or
Press the fire button. Look at the screen. It displays the voltage being applied to achieve the watts it is set to. Tune the watts to reach the desired volts?
BTW... I really hope you're being sarcastic.

 

[Rossum]

No, I wasn't being sarcastic. It just struck me as strange, kinda like driving a car with a 6-speed transmission in 2nd gear only. But then, I don't own any mechs, so I don't need to obsess over getting exactly the resistance I want out of a coil. If it's 20% off my target, it's no big deal, I set watts and vape it anyway.