I would recommend buying something with the button inside the mod, such as the cartel. You could set it down, and it would not fire.
the best which I've ever used is on GP Paps X..simply incredible
This switch
It all comes back to the nemesis.
For a non recessed/flush button assembly, its hard to beat. Smooth actuation, highly adjustable throw/tension, and wit stealth cap can have a throw of ~1mm. Not too shabby. Many have imitated but none come close IMO.
Other than that, take a look at the Skeleto Key. Should be for sale at VapeRev within a week. Check their website.
Also take a look at te MM nanos for sure. Super cheap compared to say a Chi you. And finally consider the Silverback mod by vicious ant.
Igetcha69 did a good review.
On another note Tinkie...i finally broke down and ordered the Erlkonigin based on you and qorax's experience with it