You're welcome. If ordering a Vivi make absolute sure it's the Vision brand Mini Vivi Nova 2.0 ml. When I use my Kgo with carto+ tank I really liked the 1.7 or 1.8 ohms carto BUT I like a warm vape. As far as a carto tank your best bet is to buy an IBTanked - Get Tanked With Us! Although a little pricey they are glass and are not affected by acidic juices- basically a tank for life.
Some like their carto+ tank and others like the Vivi Nova....there's a reason Vendors were sold out of the Vision Vivi Tank shortly after Chinese New Years. I would wait and see how the Vivi works. If not happy you could always move forward with a diff setup seeing as you have a Vendor in town IMO. The biggest problem with vaping is there's always another "new improved" something right around the corner.
These are the cartos I liked:
SMOKTECH C.C.V. LR 1.7 OHM XL CARTOMISERS (THE RESURRECTOR) (Box of 5)
If buying for a tank here are the punched:
510 SMOKTECH XL 1.7ohm Single Coil (CUSTOM DOUBLE PUNCHED FOR ALL TANKS I SELL) (5-Pack) you have to make sure the flange fits your tank.
They also sell 15 packs.