I have been using blueberries: do you have enough sun in that spot?

I have a large shade garden under pines. The best piece of advice I can give you is to AMMEND THE SOIL before you start planting anything. The pines spent years sucking all the nutrients out and you'll need you replace them if you want to grow plants under there. You'll also need to keep the bed watered on a consistent basis. The pines act as an umbrella when it rains, and most shade plants need to be kept moist.

That said, most shade plants will tolerate acidic soil. Check out this link for a list of plants I have under my pines...

Here is a link that might be useful: Thoughts on plant placement (big project)

All above advice is VERY sound - arbovitae, juniper, holly or yew to maintain your privacy. Rhododendrons may be good but you'll need to give them a big helping hand to get established.