It will work with both.
Your KGO battery has both male and female threads allowing you to attach any EGO or 510 accessory. Both the type A and type B eGo tanks will work on any EGO threaded battery, including the KGO.
The new eGo-C Type B system uses larger cartridges (holds more e-liquid) and a slightly different atomizer. Since they're relatively new, you may want to hold off on these until more opinions start flowing in here- maybe others will chime in regarding this.
The eGo-C Type A system (the one I use) stores ~1ml of e-juice.
To make things even more confusing, you'll also find eGo-T items floating around. The eGo-T is the predecessor of the newer eGo-C model. Stick with the eGo-C
If $50 is within your price range, I'd highly recommend the first link (
this one) that I provided. Though I don't believe they're a registered forum supplier, they have excellent customer service and will work with you if you have any problems. I have no affiliation with them, but both my brother and myself have had nothing but positive experiences working with them. That said, I definitely would
not buy my juice from them (yuk!) and instead check out the popular juice companies mentioned here at ECF.
With respect to Dual Coils, I agree with the previous poster, but I do like them because they seem to produce more vapor at a cooler temp - I'm not a big carto guy though, so not much experience to go on there. I can tell you though that dual coils will run your battery down a bit faster.
3-4 eGo-C Type A tanks and two KGO batteries get me through a day, vaping 18mg (former PAD smoker).
Best wishes!