I've used the Smokteks and for a very short time Boges. I currently use the 510 Fusion and Platinum punched! from Ikenvape. I've found them to be a superior carto to the other two brands and to last longer, but they are extremely difficult to find in stock.
When your girlfriend complains about the cost of cartomizers to you, remind her how much you once spent on cigarettes (what? $ 5-6 a day?) and how much you spend now on cartomizers ($2 each), and that the cartomizers will last 1 - 3 weeks. Sounds like vaping is saving money to me.