The DDL-8000A is JUKI's everyday workhorse for straight seams. The motor sits directly on the machine shaft, so there is no belt or separate motor to tune, and the thread trimmer finishes each seam with a button press instead of scissors.
For a boutique sewing blouses, shirts and kurtas, the medium-weight MS model is the usual choice; units working with denim should look at the SH or SJ versions. It does one job, straight stitching, and is built to do it all day.