I'm really liking the Elecraft K3, P3, and KPA500. I've made several DX contacts (including TX5K) and am very pleased with the receiver and ability to locate signals with the P3 and external SVGA monitor.
The KPA500 is so integrated with the K3, it's like simply having a 500W capable radio. Turn it on and operate. No tuning or worrying about band switches.
I'm so glad I went with this setup!