I think the 20GB has hardware support for the PS2 and PSOne games that is more complete than the limited software support in the later models. I think that was one of the reasons they were able to lower the price. Also, Wi-Fi is all well and good, but ethernet cable is pretty cheap at online clearance electronics stores like TigerDirect. Last I looked (not this calendar year) you could get 100 ft for < $20.