Napa sources from Spectra.
I use them fairly regularly at work, and don't have many problems. Shipping damage is always the biggest issue for me with replacement radiators from any manufacturer or seller.
I have Napa Spectras in both of my trucks. A Canadian one in the 2002, and a Chinese one in the 1994. The Canadian one has somewhere around 45-50K miles on it and is doing fine. Aside from stampings, it was hard to tell apart from OE. The Chinese made one in the 1994 fit fine, but the plastic for the tanks looks cheaper (glossy; Canadian is matte, like OE), and the rubber bushings where it mounts already have tiny cracks in them. So far no leaks, but I definitely think it's a lower quality product than the couple year older Canadian one in the other truck.
Some parts chains carry Ready Rad instead of Spectra, but in my experience, Ready Rad fitment and quality aren't as good as Spectra. If you get a good price on a higher tier brand, by all means use that, but overall I'm okay with Spectra radiators.