I've started with an ego AIO. Alright, but I think it's dying on me already and looking for a backup/upgrade. Any pros out there have advice? I want something small, pen style like the AIO. I would like to be able to use it with WTA and nic salts (high ohm, sub ohm?). What's good? I really don't care about the "cloud" just want good vape delivery and reliability.