Last week I picked up a new Windsor and Newton Series 7 at Game Kastle to use up my Gift Card and I have been very happy with it. So far I have used it for about 8 minis and it is holding up really well. Its a very nice brush and for sure gives the Raphael's a run for their money. So far its held up a little better than my last batch of Raphael's but I was pretty harsh on those brushes. Overall its a great brush and I might have to order a batch of them once this one burns out.
So to sum up: I highly recommend both the Windsor&Newton Miniature brushes and the Raphael's. If you order them online you can save a ton of money and these brushes are really far superior to the GW and other mini company brushes. They have really helped me with detail and with great brushes painting really is way more enjoyable.