i can only speak of the beretta px4 9mm which i own..just bought in 12/06 and the gun i have right next to me as i type. The gun fits well in my hands and shoots well...da/sa trigger and very nice looking..recoil is minimal (like my other beretta 92fs). I really like the px4..it is my nightstand gun. Shot well over 200 rounds already not a single misfire..easy to handle..i have an m6 insight tactical light/laser..can't beat it. I don't think you can go wrong with the px4...i am a happy owner.
the walther p99 ...well..i just bought it online yesterday night. Shipwreck and others on the board hooked me on that one... It definitely looks nice. all german made, and shoots well and accurate per ship and other owners.
I can't wait to pick up my walther next week..will fill in the rest next time.
btw..the p99 i purchased was in 9mm AS standard...got a reasonable deal..