I have a Sapphire 830 also, and would NOT trade it even to go up a level...
About the only thing it doesn't have that I would like is the "low thread in bobbin" feature that lets you know to change bobbin.
Other than that, I have had it 3 years and just took to have tune up... (oops! should have done sooner, I know!But there weren't any issues!)
Just my two cents- You need to get a Husqvarna!