Hi, I assume you are using the PureX HXT-P1 (or other color), which is not really designed to be used as playing cue, but as a Jump / Break. You will have a hard time finding a 3piece butt, especially for a playing cue.
The Poisons you were looking at with mini radials are also not made to be used as playing cue, but as breakers & jumpers (the VX line)
Keep the PureX as a very versatile breaker / jumper, and get yourself something with a Radial Pin for playing with your future Jacoby Black CF Shaft. (of course, keep the extra playing shaft your PureX came with as a backup)
You seem to like Poison (I do hehe), so there are some very interesting options right now that did not exist at the time you posted : as you probably know, most Poison cues come with a Uni-Loc made "Bullet" joint, which isn't great for shaft compatibility (although, Predator recently started making Revo shafts for it), but just before Black Friday, Poison silently released 5 models with Radial pins :
- Cyanide Purple and Cyanide Steel Grey & Cyanide Purple : both currently selling for 149.50 USD on Poison's site
- Strychnine ST1 Black/White, ST2 Golden, and ST3 Grey : ST1 is currently 215.40 USD, and the other two are 199.00 USD
You may remember the Strychnines from seyberts.com sold last year as Poison Special Editions .. that's when I bought mine (sadly on the last batch, the first batches were sold with Predator Shafts, these will come with the Venom II shaft and the Sarin tip)
I'm really happy Poison is finally offering something other than the Bullet pin !
Cheers !
Berzelius