Pairs are only good to trade if they have some good movement and that movement should be natural other wise it is bad to trade because we know that some artificial type of movements in the market is there. I dont follow many pairs but i feel i am good only in euro-usd and gold, further concentrating on less pair/one pair help me know more about it and so i can trade with good knowledge of what i am doing. And when it come to strategy i only do either scalping or long term investment like trading.