On reflection, I think in your case I would go for a Forsythia, it's fast growing, gives a bit of colour in Spring - sometimes autumn colour as well, and it can be cut back if necessary. It's not evergreen but the dense twiggy growths should be adequate I would think.
Fast growing conifers are a pain in the backside eventually and I would avoid if I were you, but it's your decision. The plant I highlighted is difficult to find.