Mining

This is my first topic here, so please excuse if I post in wrong place. Just got my 2002 IS300 Sportcross. The pre-owner gave it too much air for rear-tires and the middle part wore very bad. Need new rear tires that are safe, dependable, not too expensive etc. Live in Knoxville,Tn. Will be driving mostly stop and go, to school, to friends, and sometime 100-mile trip etc. What would you recommend? Thanks for helping! And, Do I need to do an alignment after I replace the tires.