You may want to consider the RF-PRO AS (Rapid Fire) from Custom Brackets. It's the least bulky of all the options I've seen, keeps the flash closest to the lens-axis (to reduce shadows when used for fill), and won't interfere with your regular shooting-style. Custom Brackets is known for their high-quality products, and I've seen good reviews for this model. As much as I love all my RRS-stuff, after a lot of research, I believe that the RF-PRO AS is the flash bracket I'm going with...
this does look to be a viable alternative to the RRS, and addresses the concerns I expressed in the previous post ,namely that the bracket should clamp onto an existing plate and not require its own plate. An advantage to the Custom Brackets that comes to mind is the stability piece, where you can set the whole assembly down, but this comes at the expense of bulk. I do like the collapsible feature a lot, which means that it is one piece.
Another point to bear in mind is that flash head height height above the lens is important, so that even without bounce, the shadow behind the subject appears slightly lower. So whatever solution you choose, imho it needs to locate the flash higher than the camera's hot shoe.
Its hard to evaluate these without using them -- So I can only point out what I like a out the Newton and what I think needs improvement. the things I don't like about the Newton are:
1. stability. the fully loaded solution will flop around if you're not careful
2. the bracket requires its own plate and does not clamp to a std L plate for example
These elements may have improved over the years; my Newton is about 5 years old.
Both the Custom Brackets and RRS solutions solve the above two problems. one thing I do like about the RRS solution, which would have been particularly nice in my shoot, is that the bracket clamps directly to the lens plate for collared lenses. for heavy lenses this is an advantage and relieves the camera from having to support anything additional. That's something to consider if you expect to shoot primarily with collared lenses.