The Otterboxes are definitely always a pretty valid option when it comes to cases, but sometimes they do add quite a bit of bulk to the phone. I was just searching around and fell upon these Diztronics. Seem to be pretty decent/ Amazon.com: Diztronic Matte Back Black Flexible TPU Case for Motorla Droid RAZR HD (Verizon - NOT FOR MAXX HD) [Diztronic Retail Packaging]: Cell Phones & Accessories
I love my incipio case i got from Amazon. It doesn't add much bulk and its two layers of protection.
http://www.amazon.com/gp/aw/d/B00A3T...ls_o02_s00_i00
I got this one. Looks good and feels good. Comes on and off easily for dockin and matches the Droid theme
http://www.amazon.com/dp/B009WCGVXW/..._am_us?ie=UTF8