I prefer to make them myself. Mainly because the store bought kits from companies like Aqueon/All-Glass are made of plastic so they get brittle after a while. A DIY Stand/Return pipe will last much longer being made out of actual PVC. But just a heads up if you plan on using "Loc-Line" for the return that stuff adds up fast and you can easily go past the price of a store bought kit which already includes the "Loc-Line"
There are way to quiet down the overflows. Tank noise is usually a combination of loud water flow, splashing noise from the overflow, air/vapor locking in the tubing, vibrating hard plumbing, etc. Are you sure the noise was coming from inside of the stand pipe itself or just loud draining noise from the overflow box?