Many of my collegues have a cheaper bluetooth keyboard case from eBay.com, Amazon.com or Overstock.com, with a couple being on their 2nd or 3rd case due to cheap iPad keyboard issues. My opinion is that if you are in the market to protect your iPad with a bulky case, you may as well get one with an intergrated keyboard if you think that it will get some usage.
The bluetooth keyboard has an awesome battery life, and may help you leave your laptop at home more often. I have tried out the keyboard case, but just didn't find that I use if very often. If you are in the market for a bluetooth iPad case, or you think it will make a nice Father's Day gift...there are some nice deals now.