[Closed] Which turbo trainer? Or even exercise bike?

For health related reasons, Mrs NBT is under doctors orders not to go mountain biking. Gentle social cycling may be an option in the near future, but for the moment the doctor (a Mr, not just a Dr, so quite high) had advised she stick to a stationary cycle.

A friend was kind enough to loan us his turbo which Mrs NBT had been using to maintain fitness, but it's time to give it back and sort out something ourselves. The turbo we've been using is a Cycleops JetFluid Pro, so I'm wondering whether to get the same one (or the current model), something more expensive (or even something cheaper), or whether to get an exercise bike.

I don't think a spin bike would be a great idea as the problems are to do with her hip: I think a fixed wheel might be a bad idea for that inevitable moment when she forgets to keep pedalling.

Any advice and/or recommendations for the type of equipment or even specific models would be appreciated, cheers.