Mike,
I am lucky enough to have a job that pays me to go to car shows and I talk with many people. Customers and other vendors so you see and hear all some things just make you wonder why?
But with that being said I also get to see and hear all the good and bad about vendors and the product they sell.
There is a list above that is a good list for quality parts. But there are others IMO that are just as good or better out there.
IMO N&N is as good as Westcott but have not been around as long and are just getting the reputatiion that Westcott and Redneck have had for a while. People build a better mouse trap every day and I feel Duane has. I love my car and I feel the quality is as good or better than anyone else out there.
I also feel that kwik wire is every bit as good as Ron Francis and a better value.
I have used RF in 2 builds and used KW in the last 5. The only advantage is with RF you run the wire to the box with KW they are in the box and you run them out to where they are going. This can make for a little of a hassle until you get them seperated. But 5 minutes and you are set. KW also have a built in kill switch in all units that will help with theft.
Teas I dont care for..... great product but I am not crazy about the people and the customer service and to me that is just as important as the product.