Couple of thoughts: first, some kind of backup is always an excellent idea, and the sooner the better. And second, the more you know about the PV you have, the more you'll know about the one you'll want next. IOW, what do you like about the one you've got now? What do you wish it could do that it can't?
Some other posters have suggested the Twist; I haven't tried those but variable voltage is a great thing to play with if it interests you. It adds a lot of flexibility to the vaping experience, and for me that's part of what keeps all this stuff interesting & fun! And, it uses 510 threaded attys, cartos, etc. which I believe your existing PV also uses (I could be wrong about this).
Best wishes & Happy Vaping!
