I like the sound of your sauce, too, Steve, but I'd probably saute some onions in olive oil before adding the mushrooms with a pat or two of butter (trying to control my husband's cholesterol!) I love the way sauteed onions and mushrooms work together. I also like to achieve a nice golden color before adding the garlic, then the wine, broth and herbs. And for an everyday thing, I'd use milk instead of cream, whisking in my "secret" thickener of dry-toasted flour to thicken it. (Pour the slurry through a fine seive, just in case!) Toasting the flour ahead of time and keeping some on hand makes it really simple to make sauces and gravies that have flavor as if you were using a roux, without all of the extra fat and calories of the extra butter.
But, if it's a special occassion, definitely go for the butter and cream!