Best Oblivion mods?

I was wondering what mods to download for oblivion. I know sometimes mods can alter programs in a negative way, and i wanted to avoid such occurences.

if you would, list some the best or must have mods for oblivion, the effect, and where i might find it.

any help is appreciated.

Even if you don't have the registered version, it works perfectly fine. After 30 days it will ask you to register (buy the licence) but you don't need. It will still work. Also, make sure you update the winrar often because if someone .rar's a file(s) with a newer version of winrar then the one you use to open it, you will occasionally end up with corrupted files.

The best mods in my opinion are OOO's, mob adrenaline, and all the texture enhancements you can find.