I've had the USP, and still have a P2000 and P30. All three are amazingly capable weapons with the P30 being the best "service size" weapon, and the P2000 generally better for concealment. They are an evolution of the USP.
The P30 is, IMO right there with the G19 as the 2 best pistols in production today. The P2000 is very close also.
How's the trigger on the 9mm P30...that is, 4#, 5#, short reset, etc? I haven't been able to find one to feel it.
Both my 9mm and .40 P30 LEM's were stock V2's and I changed the the springs to make them V1's. And they are both right at 4 lbs and are very nice. The reset isn't as short as a USP or HK45 LEM but for me after some practice and building muscle memory its a non issue.