Anne: Check out http://www.lululemon.com for their running tights and crops. Lululemon alters all of their clothing for free. I own three pairs of their running tights and adore them. Look for the tights that are listed as Run. Warm for cooler weather, but the luon fabric wicks very well so one doesn't overheat. They provide the perfect amount of compression (hold your muscles in place to prevent any jiggle, unwanted movement without causing bulge or muffin top). The seaming and construction is made for a woman.
The CW-X tights are very popular, too; however, I have not road tested a pair.
Also, if you decide to test out the Vibrams, shorten your mileage. It will take a while for your feet to adjust from arch support and cushioning of your regular trainers. I do not own a pair, but most of the folks at my gym do and swear by them. Like you, Anne, I do not enjoy wearing flats unless they are trainers. Love me some 3-4" heels.
Let us know what you decide.