I have a Velocity, but it's modded BF, so I keep it on the Reo. The Reo being a one battery mech, I can't get too wild on builds in it. Right now, if memory serves, it's wearing short loop 26/32 Claptons at about .5 and a horseshoe wick. There's a pic of that build in my previous post. I really like the Mutation V4 myself, even though I generally don't much care for bottom air drippers because they weep. Still, I have 3 V4s; they're really versatile. I have one built .7 slick wire 28s for the old lady, another with .3x.8/32 Aliens so low I only dare to run it on a regulated mod, and still another built .4 26/32 Claptons on my Tree of Life. My favorite RDA-- as if such a thing existed; favorite for what purpose?-- is probably the Wotofo Sapor. Top air, but airy enough for cloud; can close it down and coil it as a flavor chaser too. I have one of those on the Wotofo Phantom coiled .6 with 28 SS316. Running it at half air the flavor will make your eyes water. I've got my desktop DIY Apple-Cinnamon in it. I didn't know I could make a juice that good, lol.
Have a care with a mech, if you get one. Don't get me wrong, I love me some mech mod, been a mekkie for years. But they are not as powerful, nor as safe, as a good, modern regulated. Nowadays, you can get a lot better cloud from an RX200 than you can from any mech in existence. Learn Ohm's Law, learn battery safety and, for Pete's sake, stay away from the "faux hybrid" top caps with no center pin. Those things are pipe bombs. He's a couple pics showing the diff; center pin top cap left, "faux hybrid" to the right:
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