Troy Barbell & Fitness Troy VTX SupraBar Curl Attachmenthent is a pretty good but it is on the pricey side at $140 to $180 new. It is pretty good for the bicep movement.
Matrix Ultra Pec Fly / Rear Delt is a great piece of equipment to offer a good stretch in the chest movement. This is an expensive piece since it is a commercial quality.
Matrix Aura 5-Stack Multi-Station is an amazing multi-station equipment and the cable stations are smooth and it well built to withstand lots of years of abuse.