What do you mean you miss SUF?(I still use it fine) anyway, for Unit Frames you should try oUF, it has several skins and they're all pretty awesome (search ouf in WoWInterface). For polishing purposes of the overall UI I would also suggest CleanIcons - Square or CleanIcons - Thin. Your FPS problem might be because of FuBar, try playing without it and see if that changes anything. For buff and debuff skinning/moving you can also try Raven, Masque and its skins also skin your bars. I hate the default WoW font, I changed it as soon as I learned how to, makes a UI look 1000 times better. You could use Fonter for this, so you don't have to go through the hassle of changing your Font folder.
I use all of these addons, I find they make my UI look polished and clean. Hope you like them.