There are so many sub ohm tanks out there nowadays. Many are capable up to 50watts. You have to find out exactly what you want besides wattage capability. If you want clouds and high wattage, go with the Smok TFV4 mini. If you want flavor and ease of use, my favorites are the Tobeco Super Tank mini and the Kanger Subtank mini (Toptank mini is the newest version but nearly the same now with top fill). Super Tank mini is compatible with the majority of Aspire coils which every shop and online vendor carries. Kanger only accepts Kanger coils which are fairly available as well, but if you go that route, I would recommend the original OCC coils as compared to the new SSOCC coils which have been known to cause leakage.