For easy tanks, my favorite is still the iclear 30b, gets okay reviews but I have had no problems and gives me pretty decent sized cig type clouds, perfect for me. I have been through countless tanks and found this one to be great, as long as you don't use really dark juice with it.
Now if you want to rebuild Lemo works great, and you have many options on how to build. In fact about to build me a coil in a few min's, at a higher ohm.
Good luck to ya!