It'll have to be a yew of some sort, for both shade and pruning tolerance.

Resin

Or maybe a dwarf Hemlock? Check out the Gentsch White Canadian Hemlock.

Here is a link that might be useful: Gentsch White Canadian Hemlock

I'd recommend Happy,the other 6 have bad habits ;)

That 'Grentsch White' doesn't look like any I have ever seen. The growing habit is to open. Branches are to long and leggy. It looks more like a Tsuga c. 'Albospica'.

Tsuga c. 'Grentsch White' would be a good choice for the conditions you want to grow it in. It takes well to shearing. I don't know if zone 7 will be to its liking.

Go to the ACS data base for a more accurate photo of this conifer.

Dave

Cryptomerias tend to be more shade tolerant than many other types of conifers. C. japonica 'Knaptonensis' is a slow growing, rounded mound that will require minimal pruning to remain that shape and size and is dusted with white on all the foliage tips. Needs at least partial shade.

Here is a link that might be useful:

You may want to stay away from Tsuga canadensis. The Hemlock Wooly Adelgid is knockin' on your door in Maryland.

tj