Without knowing your game or seeing your swing, the best advice I can give you is if you're left handed - get a left hand driver, and if you're right handed - get a right hand driver.
Seriously, there are too many variables between what we play and what you play. All Titleist drivers are top of the line, but designed to fit different swings. The specific model is just the start. The shaft choice is what will fit you more than the model.

100% agree. 19 handicapper and almost 80. Always get a fitting. Don't waste what little retirement income I have.

Adding to Barry and Chuck's fitting thoughts, I strongly suggest doing it outdoors so that ball flight can be observed. I am not a big fan of hitting into a net and letting the monitor tell me what is happening even though the current launch monitors present useful information. A true fitting professional might also be able to give you some information about what your swing is doing or might need adjusting to maximize a new to you driver. It will be difficult, though, to get a fitting for a prior generation product as most fitters return the obsolete models once new ones are introduced.

So many times, I see golfers tell the fitter what they want/need. Most of the time, the fitter will be able to show the golfer what performs best and why. Trust an experienced Titleist fitter. They go through a strong training program to help dial in the variables of the new products.

I can understand the notion of saving substantial $$ with a pre-owned or demo club. You may or may not find one that suits your specs (shaft, primarily). If you spend more for a new/current model driver, you won't shouldn't need to upgrade for at least a couple of generations (WANT to upgrade is a totally different topic!).

Good fortune to you!

David Ayres, my fitter knows my game better than me. At my age, he says loft in a driver is your best friend. Play 10.75 loft. Hit better than average distance (210+) and in the short grass. "In the short grass". When I go in he hands me what I need and is usually on target. He fits for all top name companies. 35 years experience. Hard to get an appointment, for some. FJ and Titleist account.

There is no way us amateurs can guess what would work best for you.

Since you are looking for a used club, that limits your options. All Titleist authorized fitters only have the GTS fitting equipment. If you live near a major urban area, there may well be a retailer with access to a substantial used inventory. 2nd Swing is one example. Dick’s/Golf Galaxy never seem to have much used inventory.

Your other option would do an online chat with someplace like 2nd Swing where they ask questions about your swing, flight characteristics with your current driver and suggest some options. Assuming they have that model, loft, and shaft combo in stock. They usually offer full store credit if returned in 30 days and you can try option B next.

Good luck.