I'm surprized you don't like the HK P2000 sc if you like the USPC. it's a bit shorter in length and height and can be had in LEM and SA/DA.
As much as I love HKs, I wasn't overly impressed with the p2000sk. According to HK's website, it is thicker, longer and taller than my USPc. That seems hard to believe but I know it is wider. Plus the one thing it was missing for me was the deckock/safety lever. I know the walther doesn't have one either and that's exactly why I don't own one.
P200SK
http://www.hk-usa.com/civilian_products/p2000sk_specs.asp
USPc
http://www.hk-usa.com/civilian_products/uspc_specs.asp