HK USPc
I bought an HK USP 45c that I intended as my 'confiscatable' carry gun. I'm partial to the "1911'" format-- true 1911's, KZ45's (and the KZ 45c) and Kimber Ultra Ten II. The reason I went with the HK was it was so much cheaper than any of the other 45's I own (I paid half of what one of my used KZ's cost me).
It was a pleasure to shoot, and functioned flawlessly. However, even with an IWB holster, it hung on my belt like a boxcar. It was just so damn wide that I had a time concealing it; it printed constantly, moreso than even the UT II (which has never been detected), and I gave up on it as my CCW. I couldn't even get passable results using a Mexican carry. A shame. It was such a great gun in all other respects.