If you want to get the full potential out of the Crown with all the coils all of these work great for me Sigelie 150 TC, IPV4S, Snowwolf V1.5, Smok XCube2, all under $90 or less. all have Temp or standerd wattage. Smok Can be had for around $55,IPV4S for $65, Sig $75-85, And Snowwolf $80-100. So far I have had no problems with any of these. If you like smaller go with the Evic mini, SIG 75, or IPVD2. all single batteries. for $50 or less.