Since NET's are soooo hard on coils (I re wick and dry burn after each tank) it's advisable to get something that you can rebuild. Personally, I like these. Joyetech eGo ONE Mega V2 Tank
using the CLR (rebuildable) coil.
The main reason I like them (other than very good flavor) is that it's a swap and go tank. I have several extra prebuilt coils that I simply swap out when needed and rebuild when time allows.
The link above is for the 4ml tank. They also have it in a 2ml tank. Joyetech eGo ONE V2 Tank
good ideas. About halfway through the tank I run a pipe cleaner through the Aspire Triton coil or Uwell coil. That gets rid of a lot of junk before it needs a dry burn. Yes nets can be somewhat "dirty"