What manufacturer of the hardware needed for tkr surgery would you recommend? The patient is an active, 58 year old male that is slightly overweight.

Many good choices. The choice of implant vendor for a total knee replacement prosthesis is usually made by your orthopaedic surgeon. There are many high quality options available. For the younger, more active tka patient my choice is the verilast knee, from smith & nephew (full disclosure - i receive no royalties or financial compensation from smith & nephew).