I just reinstalled Oblivion GOTY
And I have OBMM, Qarls TP3, and the SI Texture mod, but that's it...

What else should I get to bring new life to the game?

I dont want to have to deal with a ton of mods, just enough to make the game playable again

http://www.gamesas.com/?showtopic=1010109

http://devnull.sweetdanger.net/obliviontextureoverhaul.html
http://devnull.sweetdanger.net/other.html

And assuming you're not talking about only graphical improvements I've got dozens of these topics http://www.gamesas.com/index.php?/topic/1072579-the-any-mods-list-of-topics/page__p__15593408__fromsearch__1&#entry15593408