Yeah, if you want to hang onto high-speed synch, the ttl PWs and RadioPopper PXs are (right now) the only way to go. But I do know that Cybersyncs can be used as shutter remotes with
an additional cable, just like PWs. I've heard of
hacks to turn the V2/V4s into shutter releases, but I'm not good with the soldering.
The Yong Nuo RF-602 actually comes with the shutter cable, and given that I can get one transmitter and two receivers for ~$60, which is less than most third-party radio shutter remotes, I'm tempted. Canon, for some insane reason, charges $350 for theirs. :eyeroll:
Damn you, Canon for making my RC-1 worthless when I "upgraded" to a 50D! [grump.]