If the vertical turbo stroker is anything like the one I reviewed with my partner (and it looks basically the same), don't even go there! It was garbage.. Seriously.
I feel like I would wait on the realtouch until they refine it a bit more. It can only be used for short periods of time, some people say it feels like a cheese grater and it's the first version they have out...
I'd vote for the Cobra Libre. I just notices thattThe RealTouch has an SDK, which means someone could potentially write software that would make it so the device wasn't tied to their video on demand service. If I had the scratch I'd buy one and get the dev kit and hack something together, but that's a bit more cash than I want to put into something I haven't even tried.