I think you can make use of the .380 (9x17mmK) or 9x18mm for personal defense, but on the other hand; besides size there is no real reason to go below 9mmP in power. Of course, in 9 times out of 10 i would much rather be packing a rifle then a handgun in a firefight. One important factor of a handgun for personal protection is the deterrent factor when opposed to threats who is not armed with guns, and then pretty much any gun will do.
I think the Walther looks interesting; a shrunken P99 which makes me think about the failed russian design P96S. Not so sure about the quicksafe thing...
What is that part of the trigger guard that looks like it is a moveable part? Just design?