Well I need to buy a walk behind aerator for my 1st year in business next spring. I mostly need it for residential only, about 1/3 acre, some of them have a lot of tree/shrubs to go around. Some other areas are 1 acre + with less tree/shrubs to go around. I use to work for a company for 2 years for aeration, we were using the ryan lawnair V, which worked very great, and also the bluebird which were ok. So i'm asking which one I should go for, obviously it has to be used, and looking in the 1000-2000$ budget, I think that would be good enough for my first year.