I put down tall fescue but previously had Kentucky 31 which worked out well but they did not carry any at the store. I am not in an area with manicured lawns so mixing varieties was fine with me. There is an area I am digging up in a few weeks so I may experiment with seed and some sort of ground covering to help keep the moisture in.
Last year I tried some Weed and Feed on the yard and it grew so fast it could have been cut twice a week. Speaking of which I need some new blades for the lawnmower and to get it in shape for the summer.
Unless they're totally destroyed you can just have them sharpened.