I have never once had a problem with rf interference. I live in NYC where there is plenty of that too. It just doesn't cause issues in the confined space of a bike. I just re-read where that was a problem, using an analog signal from an old Cateye. Also obsolete. I used a Cateye wired speedometer/cadence sensor for years. When I switched over to digital I had all this info to make me a much better rider.

Anyway, if you are starting fresh, just go with the latest and greatest.