What is a Scaback???
You can't compare Schabak to gemini, they're just completely different. While GEminis are made for collectors, Schabak ar for kids to play with (at least in my opinion). Herpa are a bit of both, but they are certainly more collectable since they changed to the new generation.
Nevertheless I still own around 400-500 Schabaks along with 600-700 Herpas and a couple of genminis, Dragon WIngs and others...
Are there any other noteworthy models?
I have one 'net-jets' (1/500) model, they are really well done, and of course Starjets (1/500). Tucano (in 1/400) is also very nice.