You are probably gonna get 15 hundred different shafts recommendation.
I suggest you narrow your question into 2 different categories,
1) Production company shaft
2) Custom cuemakers-made shaft
For production shaft, walk into any pool hall and most popularchoices will be mezz, predator , ob and tiger which is mostly endorsed by professionals and definitely for a reason ot visit a pool equipment shop and most shops carry these brands.
These are bigger companies , so they spent more momey on R&D so they develope better n more consistent products. (Definitely not knocking smaller companies.
Each compamy have a range of shaft to fit different needs, try all and pick one u like.
My choice is Mezz, solid and unlamimated shaft for low deflection or they have conventional maple shaft, all depends on you.
Next , if you decide to go for custom , you might as well get an entire cue custom made, popular choices for cuemakers that accomodate shaft request are Keith Josey or Andy gilbert that i know off.
You are going to need to try many different custom shaft to find what what u like and trying out custom cues made be subjected to friends that u know, its gonna be wierd to go up to a complete stranger using a southwest and expect that they will allow you to test hit their prized horse.
Hope this paints you a clearer picture.
My advice is to go production if u want a shaft and custom to get a entire cue done to ur preference and you can even fit a production shaft if u like.
Good luck
