+1 90s nissan/infiniti
the sentra, 180sx, g20 are all reliable and there are tons of parts available for good prices as well as several very large forums with enough information to diagnose anything that could possibly go wrong with them.
I'm partial to the 4th generation 95-99 nissan maxima. it was the first generation of the now legendary (if only because of ward's and ubiquity backed by marketing) VQ engine and the thing is bulletproof. I have a 98 that's been in my family since 98 and it still runs well at 200k, the interior is clean and all we've had to do was regular maintenance - oil, plugs, filters, just redid the shocks and got lowering springs, clutch, fluids, etc. Also, as long as you have a good shop or can do the work yourself, nothing short of totaling it is out of reach for fixing. This is the case with all of the above mentioned cars. Also, they're pretty quick and handle well even still.