The INS just issued a modified H&K USP to the Special Agents. They had about 2000 extra and sold them to any INS LEO for $500.00, and it included 2 LEO 13 round mags.
Unfortunately, I did not get my money together in time and missed out.
So now I'm looking around. I really like the feel for the H&K, but it's a little more money than the Glock.