Hydrangeas have a reputation as being fussy, often refusing to bloom in our climate. The main offender is Hydrangea macrophylla or the mophead hydrangea. It's the most common variety grown, but there are many different types which bloom easily.
'Invinciblelle Spirit' came out a few years ago. It was the first pink Annabelle variety (Hydrangea arborescens). Annabelle hydrangeas are the only variety which can be cut to the ground at the end of the season and will bloom the next spring. Try that with macrophylla and you'll be cutting off next year's blooms.
I bought three 'Invincibelle Spirit' hydrangeas last fall. They are blooming beautifully right now, but are also grown for a cause. $1.00 will be sent to the Breast Cancer Research Foundation for each 'Invincibelle Spirit' sold. So far over $600,000 has been raised with a goal of one million dollars.
Mine are growing in the shade, but have lots of flowers on them. They were purchased in one gallon pots and will get bigger through the years. I hope to split them up at the end of the season and grow them in other beds too. I amended the soil with compost when I planted them and they certainly seem happy. The blossoms are only about four inches across, I'm assuming they would be larger in full sun.
If you're looking for a hydrangea which is a realiable bloomer with stunning pink flowers, 'Invincibelle Spirit' is the wanswer and will be easy to find at any good nursery.