I am considering purchasing two commercial walks for next season.. 32 or 36 inchers. i have run 21's for the past 4 seasons and am starting to get sick of them. i do have a 48/20 commercial zth for my larger stuff. my questions -i recently took off the mulch kit off my zth and am currently side discharging, i find that i am continuously double cutting and leaving a few clumps in moist and recently fertilized grass. Do i need a bagger or mulch kit for the walk behind or will it be disbursing the clippings better than my zth??? - is there a general "rule of thumb" as to what size of lawn you should be using a 32 or 36 rather than a 21?? -do the majority of you guys just side discharge or are you bagging or mulching??? thank-you,, also please give suggestions on a good walk behind in the 2500-3000 dollar range..