@jklightner ; I've been trying to do the same, but, haven't come across an XK at a reasonable price, that's been worth grabbing yet. Complicating things for me is, I have a black interior, which is not very common in the world of Commanders.
Titles issues are always concerning;
If you found this XK for sale on Craigslist, I'd recommend you use caution;
While there are plenty of honest people who sell things on Craigslist, it's also pretty well documented that a lot of shady characters use Craigslist, to sell stolen merchandise quickly, in large part due to their very lax oversight.
Where you found your "for sale" listing aside, my only concerns would be:
1) Is there currently a lien on it?
2) Is it stolen?
If you can talk to the seller and come away feeling confident that neither of those 2 things are an issue, I'd say pull the trigger, you can't beat the price - especially if it's still running.
Even if it's not running, if the color scheme is the same, or similar to yours & it's in decent shape, it would easily be worth that much, just for the spare parts.