Hmmm...thinking that any shrub is going to either take time to grow, or you'll have to buy more established plants and they always cost more...
Could you skip the hedging and grow something nice like honeysuckle or clematis up the offending items? Or we put up some of that willow screening stuff to cover our less than picturesque view -cheaper than fencing but does the job. Bamboo grows really quickly, as does eucaplyptus, and a camelia will go mental in a west facing sunny spot if you wanted to go for plant screening rather that formal hedge.