Northridge also sells the Clayton cross member, same price as Poison Spyder but the Clayton comes e-coated and the PS is raw. I went with the Clayton because it was already e-coated and didn't want to pay more to get the PS coated. if you decide on the PS and paint you'll need to be sure to coat the inside really well to avoid rust.
What I didn't like about the Artec was the price, even though it's 1/4" thick, the top plate is fitted only to the top and from the image, appeared to only have a few welds holding the top plate (couldn't find any additional info online). The Clayton and PS are u-channel so they end up being double walled.
I just installed the Clayton yesterday, easy install. which ever one you choose be sure to line up the gas skid holes to the cross member before tightening everything up.