the normal Flamberge is the closest you'll get to a Kylo Ren style saber without buying the Kylo Ren Force FX saber
That being said, I can't stand the Force FX Kylo Ren saber if only cause the hilt is shorter and fatter than one would expect. Its just not comfortable to hold and akin to holding a brick in your hand. Aesthetically tho, you won't get a better looking hilt if you go the official route
By comparison, the Flamberge keeps the spirit of its Kylo Ren and fuses it with the spirit of a proper longsword to get something that is far more functional.
I think it breaks down into a form or function question if you ask me. Do yo want a 100% replica at the cost of being able to duel people, then the Force FX is going to be the best choice. If you want to sacrifice the 100% authenticity, but keep the spirit of the saber and make would be Jedi submit to you, then go with a Flamberge.
EDIT:
Review credit goes to Hazard502
http://www.saberforum.com/index.php?topic=31350.0Thats the style you'll probably want to go with, which its a damn sexy saber in its own right. Personally, I like Consular Green, but Red is the main color of choice for the crossguard series in general.