What are most of you doing about aerating your lawns? I have centipede grass and would like to aerate about twice a year. I have a Scag Freedom Z that can tow 250 lbs. so a tow-behind aerator should work OK. Now I know the ones from Lowes or Home Depot won't do the best job but I really don't want to go broke either. I also would not mind hiring a pro to do it. Any thoughts? Thanks!!