I have had all 3 of the lenses referenced here, in EF mount. The 28-80 is not much of a lens, but it is more than adequate to 'get your feet wet', but 85 is not that much different than 55. The 18-55 you already have is better. If the 28-80 is working well, you should be able to get some acceptable images out of it.
The 75-300, even if it is working well, is basically a paperweight. Take a few shots a 300mm, wide open. I'm sure you'll agree. If you are talking about the black 70-300 IS USM, that is a decent lens. I think most owners are quite happy with it. It focuses pretty quickly, has good IS,and is quite sharp at 300mm, if stopped down a bit. If you really are dealing with the 75-300, clean it up, shine it and use if for anything but taking pictures. The best budget telephoto going in the Canon EF-s 55-250. You can find it used for ~$160.