I would have to agree with buying the 13 x 40 if for only one thing. The title of the thread is, "dedicated coring lathe". Additionally, the OP reinforces the title by stating, "thinking of buying a lathe just for coring so I can leave it setup".
Therefore, why spend the extra money when all he wants is a lather for coring and the 36" is more than sufficient.
As far as buying new -vs- used -- if you have the time to search it out, pick it up, clean it, probably fix what is wrong with it and God only knows what else, buying used can at times be a nightmare with unforeseen obstacles.
Are you a cue maker or a used machinery expert and repair man? If you want to get right into cue making and your time is worth something then new is the only way to go. Of course, if you're on a budget, then used may be your only choice. Sometimes it's worth waiting and save up for the new equipment. You already have a Hightower, so make a few extra cues, sell them and you'll have the funds for the new equipment.
If you have to buy used, you go and search it out, run around town looking at machines only to find them in rotten condition.Then, if you're luck enough to find one and make the necessary repairs - how much time did you spend on all that? Time is money.
Additionally, many "cue makers" work in total chaos and are totally chaotic in their approach so listening to these 'experts' offering their opinions is a recipe and advise for failure.
You can buy used. You can buy new. If you decide to go new, take it ftom someone who has the experience with Grizzly. They work and they work well. They offer support. And most importantly, they stock the parts. We've had our machines almost 20 years and in that time we've made 4 repairs.
For repairs with Grizzly, we'd call them, explain the problem and a technician would call us back within a couple hours. He'd stay on the phone with us, we'd try different things and he'd narrow it down. Moments later we're paying for the purchase of the part and in 3 days we're up and running.
We had to repair one of our non Grizzly lathes. We called the supplier who was clueless. We got the runaround and finally a technician who said it was the 'discombobulator' and they didn't stock it. The part was $45 plus shipping from Taiwan. We were offered to pay $110 for overnight shipping. We opted for regular shipping and 30 days later we had the part. The reason we opted for regular delivery is that we purchased 4 of them as we saw the future and knew we'd wear the part out again. Plus, we weren't in any great rush as we have multiple lathes so it wasn't a big deal to wait for the part on this particular lathe. Since then we've replaced this one particular part twice. Two more to go. :grin:
And there is nothing like the smell of a new lathe. Kinda like buying a new car. :thumbup:
Conclusion: do what you think is best for you.
And to the OP -- great Logo! Best of luck to you.