I had a cateye mity 3 for ages on my old bike absolutely no probs. Recently brought a Cateye Wireless. Only thing is I found to get a reading I had to mount it higher on the forks than desired (it's got to be no more than 70mm from console to sensor) so it's not on the handlebars - seattube & rear end reading which is good cos records the k's on the trainer as well!

So brands I would consider: any Cateye, Sigma & maybe VDO.

But certainly see if you can secure your current one better.