HI
I put in some hybrid buffalo grass at my house in Wichita Kansas. It doesn't take traffic too well. My wife and kids also hated the color. I also put some out at the range in Whitewater KS, it spreads slowly, but there's no traffic on it there. Buffalo grass also doesn't get too high.
Crown Vetch is poisonous to Horses according to Wikipedia. I would also hesitate to buy it because of the flowers would be distracting.
K-31 is what is planted in my yard in Wichita now because the fescue hybrids only lasted about 2 years before everything but the K-31 died off anyway.
In the South, Bermuda is great, it grows like a darn weed.
Just my $0.02
Mike
Norman OK