I decided to buy Zenith tank
I have and use the Zenith tanks since 2018 (in all 3 different sizes) and have the Zlide tanks (in 2 different sizes), too. I tried 1 of my 2mL Zlides for about a week, but I haven't tried 1 of my 4mL Zlides yet. The Zeniths are
by far my favorite tanks. They're the ones I stocked up on the most, for the rest of my life. The 1.6ohm Z-coils are my favorites, though I've tried the 0.5ohm and the 0.8ohm ones, too. I didn't care for either of them.
As far as your nic mg...if you've only been smoking 6-10 cigarettes a day, and you tried the 3mg and found that it's too low...I'd recommend only going up to 6mg, rather than 12mg right away. I smoked 1-1.5 packs of ciggies a day for 42+ years...and 6mg eliquids worked well for me from the very beginning of vaping.
ETA: I don't see a location for you under your avatar, but I noticed you referred to someone as "mate", so...you're possibly not in the US. However, in case you
are...Ejuices.com has the Geek Vape Solo Kit for only $28.99. But...they're running a Memorial Day Sale with 25% off sitewide. So it would be $21.74 + S/H, using the coupon code HEROES. If your order is $99 or more (before applying the coupon code which makes it much less)...the S/H is still Free! I just ordered 3 more of the kits + 2 packs of Vaporesso coils last night, and it worked then!
The Kit comes with the Cerberus tank, but even if you won't use the tank...the price is still
very good for just the Solo mod itself. Someone you know may even want to buy the Cerberus tank from you, making your mod cost even less.