They make a top loader without an agitator and with the capacity of a front loader. It’s called the Cabrio. I’ve never had any trouble with it.
http://www.lowes.com/pd_36_0__?productId=3246320
I have a Bosch top loader. No agitator. Stainless steel tub. Works great. Kinda pricey. Got it at Lowes. Gets clothes clean. Uses less water than regular washer.