Hair. To cut or not to cut

I desperately need my hair cut. Split ends, horrible grown out "doo", roots, dry and brittle... the works. So I need some of it gone. I've never been so indecisive about getting my hair cut before. One moment I want long hair still and just trim it up a bit. But the next moment I want it short, definitely above the shoulders, and donate the big chunk of cut hair to locks of love or something similar. This is THE only 'medium length' hair cut I've decided like.. But I don't know.. I just don't know! Comments or tips would be very much appreciated!!!