Here are some decent/nice cases i have found over the months:
-Otterbox, they make good cases that are mostly acclaimed for their "ruggedness", from what I have seen these are sturdy and quality built cases but they might run a little expensive for you. The back latch on the otter box, some people don't like that you have to detach it every time you want to charge it. Or I guess if you wanted to get "Nifty", their is the option to cut out a slot at the bottom to access the ipad charge port.
http://www.otterbox.com/apple-ipad-cases/apple-ipad-cases,default,sc.html
-Zaggmate, The zaggmate is a very nice case/shell indeed. Keyboard is about the size you would expect on a 10" inch Netbook. Keys respond well, and it keeps your iPad screen safe. Some of the cons you could say would be, the lip on the outer edge(some people don't mind it, others cant live with it) and also tieback of your iPad is unprotected. There is a nice thread that Mickey posted awhile ago, people have talked about all of these in it. For the back, either leave it alone or get a back cover/ZaggInvisibleshield. This costs $99.99 retail which is a lot of money for just a keyboard/case, even though it is very nice and enjoyable to use.
http://www.zagg.com/accessories/zaggmate.php
Those are some of my favorite ones, you can always research some more options. It also depends how much you want to pay/what type. There are SO many cases that it is hard to chose which one to get.
-