I'd go the the H&K USP Tactical, it's a great gun for the range, and has the "protection" power you're looking for.
Highly modifiable, so no worrys there
However you can never go wrong with the classic .9mm beretta
But if you're looking for that show piece that catches everyones eye I'd go with, no not the desert eagle, its WAY to played out....
Never fails to bring a gun range to a stand still no matter what.