I was in the same boat last month. My vertex 180 aquaristik pump died and no replacement was available. I was looking at another vertex because their build quality is excellent, but also was looking at ATI because it draws huge amounts of air, and the Bubble Magnus.
I ended up going outside the norm and picked up a Nyos Quantum on sale at marinedepot. All the skimmers I looked at were 499, but 15% off the Nyos helped. It's been breaking in for a week now. I was surprised at how well it is made, and it is dead silent. It was pulling skin day 1. I am still trying to dial it in, but that's with any skimmer. So far I am really impressed. I am very happy with it.