Easy one for me...Flex Leverage plate loaded line was amazing. Most of Flex's pieces were good or great. They were absorbed by Startrac and some of the Flex designs remain nearly the same or only slightly altered. For whatever reason, the plate loaded Lat Pulldown was not continued with Startrac and that was easily the best Lat Pulldown machine I've ever used.
I'm also a fan of Strive/Prime. Great stuff, great innovation w/allowing the user to change the resistance peak of the movement. Also, love a lot of the old Nautilus and some of the Xpload pieces.
Nebula made some great pieces that I was lucky enough to have access to. They're now Arsenal. Another great company who makes great stuff out of Canada is Atlantis. If you're ever in Montreal, their showroom/gym which houses all of their pieces, is just outside of Montreal and is a wonderful gym with lots of pieces for every body part imaginable. I have not yet had the pleasure of using any Pannatta's stuff yet but hope to do so soon.