How can I effectively sort mass-imported products into collections?

Hi everyone, I have a problem regarding products in admin. When i mass-import products, i need to sort the products into collections. When the productlist is so long that its spread over several pages, its a problem to check all the products in one operation without going to the next page. If it showed pagenumber instead of lef/right arrows, it would be possible to do the job. Now, with only left/right arrows, its impossible to remember/know witch page i have checked and sorted in collections. Have i missed anything regarding mass-sorting? In most webpages with too many lines/columns for one page, you can choose how many rows/columns you want to see..is it another way to do this?