a special kind of jquery slider plugin

Question

i want to have a special kind of slider that contains elements like this one:

http://jqueryfordesigners.com/coda-popup-bubbles/

the differences are:

• you can scroll with your KEYBOARD right pile and left pile.
• the slider jumps to the next element and NOT the next set of elements.
• the element in the center will be LARGER than the others.
• the slider will show 10 elements per view, but there will be 10 elements more to the right and left so if the user scroll 2 items to the right, 8 will remain and it will fetch 2 more from the database with jquery AJAX so there will always be a "buffer".

i wonder if there is a plugin for these features or at least as many as possible so i can hack for my specific needs.

all tips and suggestions are welcomed!