my lower builds are around 0.5 ohms, and rarely I go over 35 or 40 watts.
Assuming that you are using a regulated mod since you say you are dialing in 35 - 40 watts.
On a regulated mod the coil resistance is essentially irrelevant. What dictates the amp draw on the battery is the wattage you set on the processor, and the remaining voltage in the battery. The amp draw will increase as the battery discharges.
In the interests of keeping things simple:
If you use a good quality 20 amp CDR battery like the Samsung 30Q, the LG HG2, or the Sony VTC6 ... then you are good for 60 watts per battery. If using a 2-battery regulated mod, you're good for 120 watts as you have two batteries and therefore doubling the power. If you are using a 3-battery mod, you're good for 180 watts.
If you use a single 30 amp CDR battery like the LG HB6 you are good up to 90 watts; with a pair of 30 amp CDR batteries you could safely do 180 watts assuming the mod cuts off when the batteries reach 3.4 volts.
60W or higher:
LG18650HB6 1500mah 30 amp CDR
LG18650HB2 1500mAh 30 amp CDR
LG18650HB4 1500mAh 30 amp CDR
30W-75W:
Sony 18650VTC5A, 2500 mah 25 amp CDR
30W-60W:
LG 18650HG2 3000mah 20 amp CDR
LG 18650HE2 2500 mah 20 amp CDR
Samsung 18650 30Q, 3000 mah 20 amp CDR
Samsung 18650-25R, 2500 mah 20 amp CDR
Sony 18659VTC6 3000mAh 20A CDR
Sony 18650VTC5, 2600 mah 20 amp CDR
Sony 18650VTC4, 2100 mah 23 amp CDR
AW 18650 3000 mah 20 amp CDR