I have multiple cases...

The standard one (I use this one the most)
An other silicon one from mumbi. Have the white one and not really liking the colour.
I also have a PDAir flip top case... NEVER GET THIS ONE! If you close the case it will keep the screen on! So you will about 3 times the power you will usage in standby mode.

As a screen protect I have brand less ones... Still using the first. Take it of clean it in the sink. Clean the phone screen and reattach the screen protector and your done. But it start sowing some small scratches... Think have to change it after two months.