If you want to save $1k on buying used, you should be looking at games like MET, ST, GB....the games that now have a high supply of and low buyer volume.
That said, this hobby is all about timing. I inquired locally for a used premium or LE before pulling the trigger new. 3 days after my check went through, someone local posted a DP Prem for sale. However, it was only $300 cheaper than new (w/shaker) so really $400 cheaper than new.
That begs the next question; At what point do you say it’s worth new vs used. $400 savings and you can have it that day? Even if that game came up for sale before my check cleared I would have stuck with the NIB, but some may go used for $400 savings and locally pick it up.
All in all; two things to consider: timing and what price difference will keep you from going new.