I bought my first SLR in 1978 (Praktica). I upgraded to Pentax in 1981 and had 3 models at one time (ME, ME Super and A1). I used Pentax SLRs until 2003 when I decided to go digital (although I had a couple of Canon point and shoot digitals). I decided on Pentax again as I had 6 lenses with Pentax bayonets and a dedicated flash. The Pentax packed in in 2006 and the lenses were suffering from the high humidity so I changed to Canon DSLR (which I have had issues with). If I was buying afresh I would now look seriously at the mirrorless but my current Canon lenses would not fit (without adapters) so I would consider other brands also.
I cannot see the model number on the one that
Shermie is proposing but my suggestion is to buy a model which has wi-fi which you can use to transfer images direct to your computer or smartphone without removing the SD card. Constant removal and reloading the SD cards can cause expensive internal problems with the contacts (which have occurred twice in my case).