What is the best sewing machine for heavy duty sewing?

I am hoping to get recommendations on a good sewing machine for heavy duty sewing. Something in between a home machine and an industrial as I am not ready to commit to a huge industrial machine but I sew much more then what a standard home machine can handle. For example heavy fabrics such as canvas, upholstery... show more I am hoping to get recommendations on a good sewing machine for heavy duty sewing. Something in between a home machine and an industrial as I am not ready to commit to a huge industrial machine but I sew much more then what a standard home machine can handle. For example heavy fabrics such as canvas, upholstery weight, or denim and I sew for 5plus hours per day.
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