Both Toro and Snapper make good units to if your needs. I have been telling people in your position to take a look at the new Toro 30" mower, which may cut your time down. Your best bet is to demo any units you like and see how they feel.
If you're mowing 5 to 7 yards a week and looking to increase your number of yards then I would consider a commercial unit first . Save the cost of the residential and then turning around to buy commercial.