Lots.

Depends on when those sun hours are. If the area receives early morning sun...then, I'd say "No" it will not be enough for a good bud set. If, however, it gets full sun from say 11:00 a.m. to 4:00 p.m. then it will be fine. You noted the exposure but didn't say whether there were other plantings that dictated exactly when the area receives sun. I lived in Broomfield for 12 years...so "Hello" from coastal CT! You've got a tough area to garden in...my neighbors thought I was a statue in the garden holding a hose when I lived there!

I have grown "Miss Kim" in about 5 - 6 hours of morning sun and have gotten pretty good bud set and blooms every year. This would basically be in the equivalent of the edge of an open understory with direct, unobstructed front-on morning sun. The more sun (particularly overhead), the more blooms (I have seen some Miss Kims completely covered when in all day sun). But it will definitely bloom in less. And mine is in a container (going on 8 years - I revolve it to get even sun each year). I didn't have a pic of it uploaded from last year but below is from the year before:

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You could put some redtwig dogwoods there and with the variegated ones that are available, you could get 4-season interest! Alternately, you could try a Clethra alnifolia (a drawback with that one is that it is late to leaf out) or an Itea (eg., "Henry's Garnet") and you can get some great foliage in fall.

Many thanks, Jenny. I will try to find the shrubs mentioned, also, pictures of them. The dogwoods sound great.

Forget the clethra!!! It needs loose moist soil to really thrive & having gardened in the Denver area...you'd have to work hard to get enough compost worked in your soil plus you'd have to provide extra water, probably weekly, to get clethra anifolia to flurish.

The red twig dogwood or the variegated one are both good choices. There's also a yellow twig that is beautiful in the winter against the snow. The stems are bright yellow and stand out quite dramatically. They are also inexpensive, readily available, and require little to no maintenance other than annual thinning of 1/3 of the oldest stems to keep the shrub growing new colorful shoots. The stems begin to darken and loose their bright red or yellow coloring as they age...hence, the need to prune annually. Just cut out, at ground level, 1/3 of the stems taking the oldest first. Very good choice for your area. A 3 plant grouping of one of each type would be stunning in the winter & attractive all summer. I find the yellow twig blooms heavier than the red or variegated. Mine blooms in June and sets nice dark berries that the birds love.

Don't forget that Miss Kim blooms later than other Lilacs, so it is best that she is not planted in full sun. As you get near mid May the blooms cannot take the hot day long sun. Mine is in part shade and does well.