A standard reo grand or reo mini is set up for cartomizers and standard atomizers . There are some rebuildable atomizers that will work with the standard mods . The reomizer 2.0 -reomizer 3.0 -Igo bf and there are some aftermarket rebuildable atomizers that will work on standard reos .
If your planning on using rebuildable atomizers only you will want a Low profile or LP grand or mini .
The LP mods juice well is flush with the 510 connection allowing you to use larger atomizers