My monitor stands are 20 years old, but they are still perfect: Ultimate Support MS-36. I have them filled with sand and they are sturdy. The MS-45 was their 45-inch tall model. They came in black (B suffix) or silver (S suffix).
Unfortunately the MS-36's/MS-45's aren't made anymore, and I never understood why the company would discontinue a perfect product. You might be able to find a pair on the used market, which is my whole point of mentioning them.
This is also the same company that discontinued their perfect A-frame keyboard stand building blocks system. Go figure.
I have Genelec 1031A's on them, which are very close in size to your Neumanns.
Ultimate's current models are here:http://www.ultimatesupport.com/products ... tands.html
The marketing copy claims they're good, but I have not tried them.