I find the Cisco LR (1.5 Ohm) 901s and 306s are excellent for dripping on the GGTB at 3.7 volts. The LR Boge style cartomisers are pretty good too. Better flavour with the carto / 901; better throat hit with the 306. The AW 17670 should give you really good vaping all day on one charge if you vape 2-3 ml / day, and still give you ok performance for the next day too.