Sorry this isn't going to be helpful as per a recommendation. Sure lots will post some but the problem is you get what you pay for. There are cheap (or should I say most Chinese) mods but most of the times you struggle with them with various odd issues and quality you have to deal with. Not to mention a lot don't do a good job of giving you the defined output through the life of the battery. Personally, I'd say the same applies for the Evic Supreme except they tacked on a high price. So are you planning on building a .5 ohm coil and running it at 30 watts? Get what you need not what looks to be spec'd the best. Although if you are planning on building a .5 ohm coil and running it at 30 watts, then that's what you need....If You're looking at high watt you might want to consider a box mod with a
dna 30 like the VaporShark rDNA. It's even pricier than the Evic but in the end it saves you a lot of headaches in place of enjoyment. If you want something cheap you could get something like an IPV2 but then you're getting into what I said when you start reading up on all the issues you have to deal with. Unfortunately both of those are box mods as apposed to Tube style like the Evic.
From experience, I spent a lot more money on cheaper mods when I was started off looking for something that just worked (how F'ing hard is that to make!) than I would have if I just gave in and bought the Provari that I'm using now.