Hi Mike,
I think MeshLab is probably the best suited for you then. It’s price to gain ratio is phenomenal! 
I think there is a decimation brush included now, meaning that you can customize the areas. It’s a bit awquard to use though because it still doesn’t recognize edges. My only problem with it is that it has performance limits that are easily overwhelmed by RCs High Reconstructions.
Other than that, from my trials a while ago Last-letter-of-the-alphabet-Whisk (synonym) is the best you can get for it’s intelligent decemation master. It’s price is not nothing, but still within affordable range for a hobbyist I would think, Saying that, I haven’t afforded it myself yet and I am a professional…
I thought that the program mentioned by Valerio from a well known CAD developer also has some kind of limited free version? Because a good hole-filler is essential due to the holes that Valerio mentioned.
Hi Valerio,
just out of curiosity, why do you use decimation 0.5 in normal reconstruction?? Isn’t that just the same as high detail reconstruction? Does it really change anything? Because I can’t see how there could be more vertices than the depth maps provide, which would be implied by a factor lower than 1.
Another way of getting better-to-handle meshes would be to set the minimal distance of vertices - I haven’t tried it myself yet though. Does anyone know wheter this is something that interferes with the calculation before the final mesh or is it just a more elaborate simplification which would then again create holes?