Sigeli 100w or 150w is a really solid device. $80-$100 depending on model
IMO its the best mod out of China in that ballpark and if I didn't start to use custom boxes with Raptor and OKL/OKR chips I would still have my OG Sig100 from pre order as well as my three 100w Plus Sigeli boxes and the 150 I won.
Now you need batteries+charger Get at minimum two pairs (I would get 8 batteries and a charger) (4) Sony VTC4s or Samsung 25rs, I would go with Sony personally seeing as its about a buck or two cheaper. Marry them i.e label them Sig 1, Sig 2 or something and ONLY use those cells with your Sig or whatever. Charge at same time and if you really want to be safe switch the sides they go in. Buy from a good source, I recommend illumn as I have never came across cheaper and more reliable cells. Get the charger from the same spot, the non digital Nitecore four bays which are simply last years model are dirt cheap, less then $20 I believe. $50ish if you get four cells.
Kanthal, quality cotton, tweezers, flush cutters, scissors, mini pliers (needle and reg, if you can get just one pair get needle nose), precision screwdrivers to wrap on and tighten screws haha and a GOOD ohm meter. Google usa ohm meters, only that will do for you cause ya sound like you wanna sub-ohm. Oh yea, thats another $30
$150 MINIUM. It is NOT CHEAP getting some decent gear but its an investment and if you wanna do it, do it right and safe. Go read TONS. You need to know how to use steam engine to calculate how many amps your pulling and you have to know ohms law. With a chip like the Sig you can build two 2ohm coils and have a 1ohm dual set up. Super sub-ohming is really pointless when you have a chip like the Sig has. Try a build like I said, I would use 24g and then hit it with 50w and go from there.