I already have a few subtanks so I was thinking of trying out the subtank vertical nickel coil heads since I wouldn't have to buy a new tank. How do these compare to other prebuilt TC coil heads? I really don't see myself wanting to rebuild too much so I will probably just end up buying coil heads. Going with the subtank heads would be cheapest since I have the tanks but I may be willing to try out a different tank and coil head too if they are a lot better.