Welcome to the forum
If looking for used, you may need to be patient to get what you want. Check a variety of sources regularly. Be prepared to jump on something immediately, but do not hesitate to walk away if anything doesn't seem right.
If looking for new, I would visit all of the dealers around town (South Point, Town North, Round Rock). I had a decent purchase experience with a used sales guy at South Point (was looking at used but bought new). My first couple of service experiences at South Point were mediocre, and they're too far from me for routine maintenance. I had terrible service experience at Town North (they did work without my permission and tried to charge me for it). Round Rock stepped up for some warranty work, so they are my go to dealer for now.
I do pretty much all the routine maintenance myself now. It's cheaper, and I have peace of mind that the person working on my car actually cares.