Sorry to hear your gear was lifted. Hopefully insurance covered it. Welcome to Pentax.
Here are some places to start looking.
For portraits:
FA 31/1.8 ltd, DA* 55/1.4, FA* 85/1.4 (out of production)
For weddings:
The DA* 16-50/2.8, DA* 50-135/2.8 or maybe the FA* 80-200/2.8 (out of production).
For sport, well that depends on the sport:
The DA* 60-250/4 is quite versatile. Beyond that, the DA* 300/4
The out of production gear I've mentioned is fairly commonly available either through the marketplace or ebay.
Also, based on your wedding thoughts, you might consider a second K-5 body, but it probably depends on how many weddings you are shooting
.