There's no shortage of good mechanicals out there.
I have a KTS+ Sigelei 8w and Nemesis. All good in their own way. The smok magneto is also quite nice, but you can't squeeze in an 18650 and a kick (if that interests you...which it does me....to a certain extent).
Now... the main consideration. I wouldn't personally buy a cheap clone off a cheap clone website. There's just no point i.m.o. you basically pay somebody £25 for the pleasure of getting it in 2-3 days. They've bought them from China (
fasttech, focal, health cabin, whatever)... so you could do the same, unless you can't bear it. My latest Nemesis was £14... or you can buy it for £39 in the UK.
Anyway... the hcigar Nemesis is great... and my favourite of the 3.
focalecig were doing Nemesis for £12, but I don't know if it's a good one.