I love my Walther P1! It really, REALLY likes Aguila 124gr. FMJ. It's powerful but not +P powerful, and it functions wonderfully. You can pick p cases of it for around $199, which is a deal in my opinion for re-loadable brass cased ammo.
Here's some over at SGammo for $197: http://www.sgammo.com/product/aguila...ain-fmj-ammo-0