I own a Yamaha PSR 3000 cost new about $1500..its has everything you could want on a board..midi in/out..16 track sequencer for multi track recording and literally hundreds of voices and rhythms you can play with your left hand as simple 2 or 3 note chords or regular 5 finger chords. There are used Yamahas around even though this one is out of your budget.
Go to http.//www.psrtutorial.com its a website devoted to Yamaha keyboard owners , players, fanatics like me. Some times you'll see some boards for sale there and you know you'll be getting a quality product that will last a while