I decided to use the CKE brand of cable railing accessories found on amazon. The cable is made by LuckIn. I explored several more expensive brands from industrial suppliers thinking the materials might be better...nope. almost all of it was coming from China so I went with a cost effective brand that had all of the accessories I needed.
One company, E-rigging dot com had some really nice fittings but they were about 4 times more expensive.
I would use this brand again, especially on an indoor application. I would probably invest in a little better, plastic coated wire if I was doing an outside install. I would avoid using the 45 degree inserts if possible. the high tension tries to pull them out of the holes. If you have more than 50 terminations I would invest in a better hydraulic crimper unless you really want a forearm workout.
Hydraulic Crimper- https://www.amazon.com/dp/B07NYXT79X?psc=1&ref=ppx_yo2ov_dt_b_product_details
Stair fittings https://www.amazon.com/dp/B07TK7NKSN?psc=1&ref=ppx_yo2ov_dt_b_product_details
45 degree fittings https://www.amazon.com/dp/B08DXKPMJH?psc=1&ref=ppx_yo2ov_dt_b_product_details
LuckIn Cable https://www.amazon.com/dp/B07P5KDZX4?psc=1&ref=ppx_yo2ov_dt_b_product_details
Swage lags https://www.amazon.com/dp/B08TMF69VJ?psc=1&ref=ppx_yo2ov_dt_b_product_details