Get a good Hi-vac blade that will lift, cut, and broadcast your grass clippings. Depending on which way your mow up and down rows where you will be mowing back over your grass this might not be the best choice. If you discharge away from the un-mowed grass then it will do the job nicely.
On the second hand if you mow like most due up and down rows you will be needing a good mulching blade or bagging blade that will help you cut the grass into finer pieces so it's easier to run over. Below are 2 links for craftsman blades that do just these 2 things.