If you want to build, a Kayfun clone-- I like the V4 best of them-- is a solid shot for little money. Top fill and an extra 5 bucks buys the "subohm kit" which is a PEEK resistor and a wider airflow pin. A Lemo2 is also a good choice. It can be coiled anywhere between 3 and about .4 with no problems. Single coil, an ingenious top fill system, great airflow control. You'll probably want a smaller drip tip for M2L. For dualies, the Fogger V4 or V6 is worth a look. I modded mine (I have 4, or maybe 6, I forget, in both versions) for better airflow, but the tighter draw won't bother a M2L hitter. The Foggers were my go-to tank for a long time. The V4s are now Old Skool and you can buy them authentic, new/old stock, for 10 bucks. The V4s are bottom fill, though; the V6s are top fill. Finally, my new favorite tank is the Indulgence MT, but that's really built for deep subohm and clouds. It has great flavor, but it shines below .3 ohms and above 40 watts. I don't think you want to go there.