I've done a fair amount of research and I may have decided on TifGrand bermuda. Its a fairly new cultivar that's supposed to be even more shade tolerant than some of the Zoysia and St. Augustine grasses. During the summer our yard gets about 4 1/2 to 7 hours of sunlight a day depending on where you are in the yard. In the winter it gets substantially less, but with bermuda being dormant in the winter, I'm hoping that won't matter.I want to rip out our front yard next spring and start over. Its got a huge overgrown island in the middle that I want to completely rip out and sod and a huge bed in front of the house that I'd like to cut back to about half its depth and sod that reclaimed portion also. The rest of the yard is a mix of a gazillion grass and weed types that look great when fertilized, watered and mowed, but I really would like to have one type of grass that all grows at the same rate and looks nice for more than two days after mowing. We're surrounded by tall woods and established trees that are not on our property, so I can't remove any to allow more light.