Oh man, you're in for a treat - things have progressed so much in the last 6 months it'll make your head spin.
For starters, I'd recommend an iStick (30 or 50 watt) with a Kanger Subtank mini - the battery should set you back $30-50 and it'll give you way more performance and life than your Ego-style spinner. The Subtank gives a lot bigger hit as far as both cloud and flavor goes as compared to the Protank (I quit myself using the original Protank 1 and non-spinner Ego batteries) - you'll have airflow control to hit it tight like a real cig or wide open like more advanced devices. There's also the benefit of having pre-made coils that are simple plug-and-play, plus a rebuildable head if you decide to get into customizing your rig somewhere down the line.
For the big Sigs, the Subtank still works, but I like drippers (RDAs, or Rebuildable Dripping Atomizers). My wife uses her Sig 100 with the Subtank, I have a Mutation X V3 on mine. Really solid device all across the spectrum - I'd have a 150, but I bought back when they only had the 100s and I haven't broken mine yet so no need to upgrade - 60 watts (heck, even 20) blows the doors off those old spinners, so I don't need the 150 yet.
Lots of sources for the iStick, but I like
@VapeSuperSaver for the Subtanks - super fast shipping and quality product, plus the owner is a forum member and pretty responsive when it comes to customer service.
Any case, you'll get a million recommendations from a million sources, but that's my two cents...good luck with the quit, and happy vapor trails.