EXS 24 Logic Sampler Users Group

I just upgraded my computer to a to a G4/1ghz machine, 1.3 gb ram. OS X 10.3.x

I currently own Logic Platinum 4.8 and EXS24, but I was thinking about upgrading to the 
current version of Logic 7 now. Logic Express seems to be in my budget but I notice it 
comes with the EXSP24 and not the EXS24....what's the difference between the 2 samplers? 
Will I still be able to create my own sample libraries? I checked the apple site and they 
really don't detail the differences between both applications.