We also use Juki to sew our garments.
Get a Japanese brand, don't get Chinese brands even though the Japanese brands are built in China.
I believe in our part of the world Juki cost $100 or $200 more than a Chinese brand. It adds up when you start buying over 100 machines.
If you are going for second hand, make sure of the following.
1. Servo driven: this can save over 70% of electricity, the old clutch driven ones have the motor running non stop. Also servo driven needs less maintenance.
2. auto-thread cutter, it is not just faster but it can save thread.