Ebay doesn't make products so technically your question is invalid. There are great products on ebay and there is total crap.
I wouldn't touch any of those rods. I can get CXracing products and they are great for aluminum piping, intercoolers and some other stuff but I would never stick any of that cheap crap in my motor.
These are the cheapest rods I would run.
http://www.matrixgarage.com/products/cr ... tsman-rodsThe injectors on the other hand were both Bosch so hard to go wrong there.
I could probably get you some RCs or DWs cheaper though.