Whey protein which makes are best?

I decided to buy some sort of whey protein drink to help build musle and help recovery from when ive been to the gym. There seem to be loads of different types and makes though. You can get whey protein drinks from places like Holland and Barrett for just 10 quid but ive noticed that some of the morewell known makes like Maximusle/ Prolab etc sell for up to four times this price. Are the well known brands really worth the extra money or would i do just as well with a cheaper less well known brand?. Also which brands would you percifically recomend?