I am not up on what is going on in the industry so I don't know if Garmin was forced to do anything or not, but the Sirif chips have been in place in their 60CS series for the last several months at least, so you can get them now.

The 60 series is more expensive then the trex series.

For what it's worth, I notice a clear advantage in terms of speed of acquisition, accuracy, and signal strength in cover in my 60csx as compared to my old etrex.