We need more info about how you vape to fine down our recommendations. Right now, the best buy on a solid mod is the Wismec Reuleaux RX200, 40 bucks at VapeNW. This is a 3 battery mod, but surprisingly small and comfortable, and no heavier than most of my 2 battery boxes. I like it so much, I have two of them. However, they are 3 batteries, and not too pocket friendly. Sigelie and Snow Wolf both make 75watt 1 battery mods I can recommend if you want to carry it around. Another option in a solid 1 battery is the SX Mini. Very nice, top quality, but 2x the price of the Sig or SW. If you can get verified, there were several of the previous model on sale here in the classies last I looked. My current 2 favorite drippers are the Wotofo Sapor and the Mutation V4. Both are pretty versatile and can be built high or low, with good air adjustments. The Sapor is top air and less prone to leaking. For a tank, depends on how you vape. If you are a low power, high ohm, MTL tootle puffer, a Kayfun clone can't be beat (any of them will do, but the V4 is top fill.) The Lemo2 is a versatile single coil machine and can be built high or low. For high ohm MTL work, you'll want a smaller drip tip. For deep subohm and high VG juices, you'll want to hog out the juice channels a bit with a Dremel for better flow. But in the midrange, it's very sweet. The best big air cloud tank I know of is the Indulgence MT. Juice channels and air ports big enough to drive a truck through. Coil it low, crank the watts and fasten your seatbelt. I have 3 of them and they rock. It has a near-twin brother, the Mutank, that can use prefab coils and has two different build decks, a 4 hole, three post system, or Velocity style 4 hole 2 post; and is available in 3 or 6 ml capacity. Telk us more about how you vape, we can get closer to what you want.