ViZi's
eCigarette Mods Database is the most comprehensive listing/description of all mods available for sale. His
Battery Chart is organized by battery type and voltage.
Some of the standard 6-volters, in addition to the SB (which AltSmoke recommends
not be used with stacked batteries), are the Chuck, XHaler, and GG. New kids on the block include the Saber Touch and Indulgence (with 6v Extended Cap). [NOTE: The Indulgence is now also available from a U.S. supplier, Vaporescence.]
I'm a bit surprised that you are only interested in a
6V mod (requiring an HV atomizer). Why not get a 5V (e.g., Prodigy V2 or Joker) or variable voltage (e.g., Buzz) for use with a regular atomizer ... or a high mAh 3.7V (e.g., Precious, SuperT/Precise, ProVape-1, Mini VapeStack, BB, or even Hello 016) for use with an LR atty?
[NOTE: All examples are tubular. There also are intriguing
box mods, especially the juice-injected ones.]