I need help. I currently do 5-6 residential yards each week. I have a Toro Model# 20076 and I am looking to upgrade. I just do not know what to get. I need something 21-22" around $600 range. Problems I am having with the Toro is it bogs down a lot and I am just not being as productive as I would like to be. I mostly mulch but bag upon request or when grass is far too tall. Please give me your suggestions. Thanks!