I've heard complaints about Kingmax and some will get something besides Super Talent. OCZ is known as a premium brand and highly rated. Others include Corsair, Kingston, Crucial, with some seeing good results with G.Skill. On the other hand some generic brands as well as GEIL don't make the grade quite often.
As far as Dell they are always overpriced. But the same can be said about buying memory from the other companies like Gateway, eMachines, even HP. EBay would be the last place for memory as far as any returns. A regular vendor like newegg, TIgerDirect, mwave, and others have their own return policies on new memory as well as other things.
Another thing that will draw a higher on memory is the type. Performance memory with faster timings will generally run higer then value ram. Currently newegg only has that memory seen in two brands only. G.Skill abd Crucial 2gb kits(2x1gb) as seen at
http://www.newegg.com/Product/Produ...21133+1052910525+1309121117&name=2GB+(2+x+1GB)