i have a question as per the cfw downloads here
http://www.iphone.greatnesstx.com/

what is the difference between the following?
activate / noactivate (unlock/ lock?)
custom boot logo / no custom boot logo (is it the pineapple thing?)
500mb root/700mbroot

so which type so I pick for a noob with 2g iphone and wanna upgrade to 2.1