My favorite one that I have used for English Mild has been Omega Yeast Lab's British Ale VIII. It took my 1.036 wort down to 1.012, dropped brilliantly clear very quickly, and really let the malt flavors shine. http://www.omegayeast.com/portfolio/british-ale-viii/
A local pro Brewer who is also known as a very well respected home brewer gave me a great bit of advice. Fruity for pale milds and go for dry on dark milds.
I like to use wyeast 1968. I feel it accentuates the malt flavor, and it drops very clear in a short time.
Eh, I may be the odd man out, but I'm a big fan of Wyeast 1084 - Irish Ale.- Josh P