I'd get a Moto X instead. I've been looking at both the Moto X and the HTC one Mini on eBay because I wanted to get a new android phone. Reasons I decided on the Moto X included:
2GB of RAM compared to 1GB which will future-proof the phone more and helps with multitasking and overall performance.
Better Camera on the Moto X, especially since the HTC one Mini's is stripped of features compared to the One's.
A more "Premium" feeling software experience with features like Moto Assist, Touchless Control, and Active Notification.
Additionally one of the main problems I have with a lot of "Mini" phones is they just feel really stripped down and are overall poorer compared to their bigger brothers.
Price wise there is a Manufacturer Refurbished HTC One Mini for $220 on eBay while there are some pretty good condition Moto X's for $200-$230. That is of course assuming you're in the US and can buy on eBay.