Haha, I'm doing that myself. Buying the
Boge F16,
6 ml smoktech,
3.5 ml smoktech and the
Ego threaded 3.5 ml.
Then I'm gonna grab the straight cone for the 3.5 ml tanks and the one with the flare for the bigger tanks.
The 3.5 ml smoktechs are about the diameter of a an EGO, the f16 and 6 ml or 4.5 ml have a wider diameter.
They're all basically the same, as someone said .. and none of those are Canadian links - sorry I just linked what I ordered. Most Canadian vendors have the smoktech's and f16 now. The Ego DCT is the only one I had a hard time finding, vapoursolutions was the only vendor I found, but again with free shipping, surevapes in the states won for me.
cloudsofvapor and phiniac both have a really good punch and fill tool. Jugheads has a super cheap punch tool, that I haven't used and almost every vendor has the smoktech filler tool now.
I've always used boges personally, the quality went down recently, but is getting better again, as did smoktech's. If you don't want to bother punching or slotting, most vendors have smoktech and boge pre-punched and flanged cartomizers - they're just a bit price-y and the dual coils won't work great on an Ego.