Refine Categories

I am in the beginning stages of designing a website for a client and have ran into a little problem with one of their requests.

They want to have two levels of selectable options with the first being:

‘Price’ with the option (ALL) (1-50) (50-100) (100+)

and the next being:

‘Size’ with the options (S) (M) (L)

They then want to have the posts render on the page that correspond to the selected options.

So if Price (1-50) was selected with Size (M) only X out of 50 products will be shown and if the Size was changed to (L) the Price would stay the same and render the next lot of corresponding posts.

Is there away to do this with multiple categories?

Can anyone point me in the right direction? ??

Thanks a heap.

Paul