I highly suggest you do not buy a blu kit. I own one, and it is a total piece of garbage. I understand what your needs are. You want some thing with a battery that will last all day, and something with with a large enough juice capacity to last all day. My advice would be to get any mod with an 18650 battery. You can go smaller if you don't mind carrying an extra battery. A carto tank with a 3ml capacity combined with that should get you through the day.
Personally I use a provari mini with an 18350 and a carto tank. I change the battery once a day. But I always have a fresh one in my pocket ready to go. I don't carry any juice bottles with me. I've never once ran my tank dry. I'm not one that changes flavors throughout the day. I vape one flavor all the time. If you are the type that likes to change flavors, you'll have to carry extra tanks/cartos.
But as I said before, if you're looking for PCC, you are looking for a cigalike. And a cigalike will severely disappoint you. Many of us own them, and many of us no longer use them. If you want one, go ahead and buy one. It's your choice. I'm just warning you. Just stay away from the blu. I've heard better things about the VOLT cigalike with a PCC. I've never tried it, but I'd expect that it's not much better than any other cigalike.