There are so many mods now its hard, you have regulated and unregulated, series and parallel and single cell.
But for 70w range in regulated there is the VTC Mini, Kanger 70w or 120w, the Vapeforward Classic, Mini and Nano, you have The Sigelei Fuchai or 75w.
Then there is the fix battery Lipo regulated mods, the Snow Wolf, the Smok M80 or newer R80.
All can deliver 75w or more and are good mods and cheap for what they can do... well the VF stuffs a little more expensive, but its only new gear.
For power and battery life, the Realeaux, either the cheap RX200 or the better but more expensive DNA200, both triple 18650 but will run Any tank/RDA.
As for RDA's... plenty but depends what you want, for clouds and easy build, The Velocity, for flavour the Magma or Snapdragon or Hobo.
Plenty of other options too and im sure others will have suggestions.