My favorite is the bernina 1008 due its design and longevity as shown by bernina.
I find the 830 to be overrated because for a very old/vintage sewing machine, it has plastic parts especially in the cams. Absolutely disappointed when I found out about this. This is also one of the reason I chose the 1008 as it's a bit more modern. Also suppose is still there for the machine. Yes it has plastic parts but as the 830 also has plastic too.
Many have touted the 830 to be the queen of all sewing machine.
Oh and I bought my 1008 for $100.