8k is good enough. Buy Legit items and good quality chargers and batteries.
For Charger I prefer Xtar Chargers (P300-P2000).
For Batteries I Prefer Imren 18650 P550 or Sony Vtc 4 P450
I all boils down to Atomizer for good flavor and Nic Hit. Im using Immortalizer for 1year now and its the best drip type atomizer for me. Cost P3000.
For the body you may want an dual paraller box mod for more power or tube type copper mod.