The Mech market is actually more diverse than newbies realise. Before you commit to buying a device, you need to think through what you are after.
Would recommend starting out with a clone, just in case you don't enjoy the device. Mechs are hands on devices, requiring regular maintenance and cleaning, knowledge of Ohm's law and battery safety. Once you understand these basic principles then owning a mech mod can be very rewarding, otherwise you are courting with danger at worst or lack lustre performance at best.
My preference is for a single solid copper tube mod, with recessed solid one piece copper switch and straight to battery 510, much like the Vaperz cloud X1, Limitless mod or the Kennedy Roundhouse.