Play with what feels good. If you can really play (have good fundamentals) you can switch between shafts pretty easily and still play at a certain level. Everything deflects to some degree. That isn't a concern. From there, it's just a matter of what feels good. When you are adjusting to a new shaft...and you miss, you'll see why (because you're not moving on the shot or jumping up) and your brain will adjust pretty quickly to start aiming correctly.
I've had cues from Southwest to Schon....tried, 314s to REVO...but I recently bought an entry level Meucci with a pro-shaft (and whatever tip comes on it), and I absolutely love how it feels. I couldn't believe it. That is my daily player. It's inexpensive, I play good with it, and because of the price, it's not "precious" in regard to dings, etc. No worries. Just my .02.