Query: What is the best gallery plugin?

Hi there,

I’m making this site which is going to be this huge gallery of images. The problem is I need a plug-in (or at least something along the lines of what I’m about to describe) that is up to the task; paid or unpaid.

Requirements:

► More images must load when scrolling down and not immediately once the page loads.

► Obviously, must look pleasing to the eye.

► Bonus: Be able to click on the image and bring up the picture.

If there is something already in existence for WordPress please let me know, otherwise, could somebody direct me on how you would begin to piece together something like this?