successful planting in containers

 
Dear All
We are having huge difficulty (for over a year now) about deciding what would be best for a specific area of our garden.(Dry Costa Blanca).  On the side of our driveway we have seven  1.5 -3x metre x 1-2 meter deep rectangle white concrete containers (with drainage) which are integral to driveway by making a wall which is stepped down with slope of the driveway. We need to screen this area and that is why we had these containers put in but I am having great difficulty about what we could grow successfully.  We will have irrigation into each container. 
 
People on this site have been very kind to give me lists of various possibly suitable plants over 18 months ago when we were deciding to go with this idea. But I have not been able to come up with something that is evergreen,(but not too dense)  can stand pot life, not too much water, full sun, salt winds, fairly quick growing, growth to about 3-4 meters, no berry staining.   First we decided on Cupressa arizonica but my mind was changed because they go brown easily and the specimens I saw in the garden centre did not look happy.  We then looked at Bamboo... ...Phylostachys nigra especially but decided against that lovely plant because of water needs and it could become unhappy quickly and lose its leaves. We have now an idea of Photinia ( Red Robin) but have been told its not wonderful in pots! I am really at a loss here and I am wondering if there a few robust plants which you might know of which would fit the bill.  I would also like to know your recommendations about the size of the plants which should be purchased.
I am looking forward to your replies.
Pamela
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