Maybe you should consider Flashwaves over the CyberSynics? I made the choice based on another forum member's positive experience and also because the recievers have hot shoes on them. Fp cables will cost you more than anything you'll save on the CS's. Have a look at the following thread (with the best deal we've found for ordering) for more details on the FW's
http://www.pentaxforums.com/forums/p...-triggers.html
As for mixing P-TTL and or Auto, there's no problem with that. I personally prefer shooting everything, including the camera, in manual for flash work and find the results far more consistent.