Ring Flash for Nikon D800

I need a dedicated ring flash for my D800. I have bought and returned two Polaroid ring flashes that were not dedicated (was not familiar with this term). Plus, there lights were a bit weak. Does anyone have any recommendations on a ring flash that would work for doing close-up macro bug shots? I have seen a Zeiko ZE-MRN1 but at this point I am getting a bit gun shy. I have been using my pop-up flash with reflectors. Any help would be appreciated.

Sigma makes the EM-140 DG Macro Ring Flash for Nikon AF, seen here:
http://www.bhphotovideo.com/c/product/352443-REG/Sigma_F309306_EM_140_DG_Macro_Ring.html

Metz Mecablitz has been in the flash business for over 30 years and makes another, model the Metz Mecablitz 15 MS-1 Macro Ringlight Digital Flash Kit, which is entirely self-contained in the ring itself, seen here:
http://www.bhphotovideo.com/c/product/928404-REG/metz_mz_15210_15_ms_1_digital_macro.html

I have not personally used either, though I have played with the Metz in a camera store. Big investment for limited use, unless you are doing a lot of macro work like flowers, insects, fungi, etc.

Hope this helps.

Frederic in Montréal

Why not consider the Nikon R1 Wireless Close-Up Speedlight System?

I have the R1 C1 macro setup. It is far from ideal. I find it sitting in the closet 99% of the time. I prefer the sb800, with it's diffuser and -7deg adjustment. With a tokina 100mm macro at 1:1, I never have any issue with subject being in a flash shadow. R1 C1 is just a pain to use, low power, eats CR123 batteries like peanuts, fragile, adapter rings, in the way of many of my pictures. It works well in a studio environment but not so hot in the field. I have several older ring flashes that are fine but only run in a pure manual power setting. I don't usually like the circular catch light (reflection) of the ring lights. Etc.. etc..

Thank you Arlon for the very informative response. I have had second thoughts about getting one for the reasons you stated above. Now I have your valuable experience. Thanks greatly.