This is how all the Sku's are.
The 20 gig SKU will support PS1 and PS2 games but doesn't have a built in wifi (not sure about the EE chip in this SKU).
The 40 gig SKU is a very stripped down SKU that not only was memory card readers removed but any hardware that was used to support PS2 games was removed. Although it had built in wifi.
The 60 gig SKU in NTSF regions had the EE chip along with every other option, but the PAL regions always used software emulation in this SKU.
The 80 gig SKU only used software emulation in all regions.
But the thing is there isn't a large difference in the number of games supported between the hardware supported systems and the software supported systems. Really the safest and best option is buy a system from your region because there can always be some problems later down the road.
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