A gen 6 Mustang isn't exactly cheap but pretty great bang-for-buck for what you get in comfort and styling. Yes, they're extremely common (but for good reason).
For comparison, my previous secondary car (before my BRZ but kept as a daily driver) was a fully loaded Suzuki SX4 that cost me $19k new in 2011. Nothing special about it except it was the cheapest AWD car on the non-pre-owned market. Last December I decided to replace it with another 4-cyl (probably FWD and used) daily driver for under $20k. Til I realized I could get something much cooler for the same budget...
...A V6 Mustang which I got for $19k after rebates and an hour haggling. MSRP was $26k but I can sell it in a few years for a just a little less than what I bought it if I wanted to (older used ones with one or two tens of thousands of miles are $19k on Carmax). A few less MPGs than my SX4 but a HUGE difference in performance and ride quality (this Mustang gen is the first with independent rear suspension) and more capable/comfortable highway cruiser than a stock BRZ. The final revision of the 300hp V6 is no joke and faster than the previous gen V8 engine. Plus bulletproof with forged components and Mazda uses a variation of it. I prefer its base trim seats (more supportive and has bolstering), seat/steering wheel/pedals range adjustment to get a more perfect seating position for comfort, and shifter placement over the BRZ.