I've had cheap electric units, did fine, not as precise as a higher priced unit, but it will smoke food. Next I built a big stainless steel unit that was propane fired. Like it alot, unfortunately, somebody else liked it more then I did.
I am now currently building and electric unit using an enamel lined fride for the box and two sets of temp controls, one for cool smoke and one for hot smoke.
I can't tell you which unit you should buy, you will have to kind of try them out and see which you prefer, it is really a matter of choice. Glad to have you here, it is a very informative place with lots of great people!