I believe most of the more recent u-remotes can accommodate most of the boxes, especially the more common ones. Just ask the store if you can check the manual for the list or look up the manual online. I have cheap Philips versions and that brand is listed. Old u-remotes sometimes work if the box utilizes a legacy code like that of a cable box.
If there's any 'special functions' on the remote for that box you may not get them on a u-remote though, usually no biggie from my experience.