I have the Poetic SLIMLINE Case and it is great. You can fold the front cover back to prop up the tablet if you want also. I would personally get a bluetooth keyboard. I have seen a few on amazon that look nice.
This one. Why would the magnets mess up the screen? It's designed with a sleep/wake function... As far as the top negative comment on that is concerned, it looks like he received an older model. Mine has a plastic fitting around the Nexus and works very well for what I've been using it for. Had it for over a month and haven't had any issues with mine.
I bought this Poetic case a couple weeks ago but it hasn't shipped yet. I was thinking of looking around at a different case but this made me rethink and even purchase the one with the keyboard and interchange them based on my needs that particular day. Amazon says i'll have the one I just bought before the other, go figure.