I am new here today & to the sport of vaping. I have a question that im sure has been asked alot but technology changes daily. WHAT IS THE BEST PEN for a straight PG/Wax juice? In your opinion obviously. Why or why not? Pros cons? Im going to buy a nice one when I decide on a particular model. As of today im using an o- pen & filling my own carts. For $120 & under what pen would you use? Thanks!