I'm a huge fan of the 0.9x0.3mm wire
@Don29palms is talking about. Saw him mention it in a few threads here and figured I'd check it out. Picked a spool of it up from kaybeevapes as well.
I've been running this 7 wraps @ 3mm and the Ni80 comes out to about 0.4ohm for a single coil. Heats up quickly, and produces a lot of vapor at lower wattages than I have to use with other wire.
I've been using this for several months now and it's pretty much all I've been running in my DTL setups since first trying it.
If you're wanting to try flat wire builds but want something easier to work with, give this a try. It's much easier to handle than I thought it would be. Other ribbon wire I've tried is like 'tinsel' as mentioned. Was pretty excited when I saw Don post about this wire and have been pleased with it. Pretty easy to wrap/coil and holds up very well.
I've since picked up another spool of the Ni80, and also the SS316L. The SS316L will work out well in single coil setups for me, but obviously ohms out a good bit lower. The Ni80 is just about perfect for me, I like 0.3 to 0.5 ohms on a single coil setup.