Basically, you can buy any mod that has a 510 connection with the Big Baby Beast tank, you don't need to buy the exact Smok V8 Stick. If it were me, I'd go with something that would allow me to customize the amount of power the coil in the tank gets instead of a fixed power source like what comes with the V8 stick. Other members around here will give you lots of suggestions on what they like best. What would you prefer, something with a non-removable battery that has high battery life (high mAh) or removable batteries so you can charge them outside the mod? You'd get better bang for the money if you switch to something else.