The only 80GB PS3's with built in memory card readers also have 4 USB ports, and are backward compatible (limited) with PS2 games. The only 80GB models that have all this are the MotorStorm 80GB bundle, and the Metal Gear Solid 4 80GB bundle, both which are no longer made.
However, you can still find them on Amazon ( http://www.amazon.com/PlayStation-Metal-Gear-Solid-Pack-3/dp/B0014WJ78E/ref=sr_1_2?ie=UTF8&qid=1233615888&sr=1-2 ) brand new, but will pay more than the current models. If you just want the memory card readers, then buy an external USB memory card reader ( This one has addtional USB ports also: http://www.amazon.com/Playstation-3-Media-Hub/dp/B001BSA5Z0/ref=sr_1_1?ie=UTF8&s=videogames&qid=1233616032&sr=1-1 ).
