Ooooooh!!! "Danger, Will Robinson, Danger!!"
Look, a Mech Mod, especially something as tried and tested as a Nemesis Clone is perfectly fine for use with either an RTA or an RDA
. All you need to bear in mind, is the ohmage that you'll be building to with whichever atty you decide to use. All you need to do is get yourself a decent quality Battery and a good ohms tester or a multimeter. If you work to the rule of thumb that you don't go below .8ohms with the RTA builds, you'll be safe. You can go lower of course, but whilst you are finding your feet, I'd not go too much below 0.7 or 0.8
As far as a good tank goes, the world is you oyster. Personally, I love what a Kayfun, Taifun, Heron etc do when coupled to a nice Mech, but you can use anything that floats your boat.
Mechs seem to be regarded as potentially dangerous Mods these days? I truly believe that this has come about by the vast numbers of people who start out with Regulated devices which of course offer protection of just about every sort, but a Mech Mod used sensibly, will surprise you greatly and of course, particularly with anything designed around the Nemesis style, spares are so easily found these days that they will out last the majority of Regulated Mods. Years ago, when the Regulated Mods first started appearing at prices that finally made them affordable, someone once said, "Yeah!! Tremendous, but are they as Future Proof as a Mech"?
Awful expression I know!! But actually, assuming they meant "Long Lasting", they are correct.
Yes, Read up on ohms Law, use common sense and you'll have a Mod that will go on for ever!!